Réchauffements climatiques il y a 56 millions d’années : la biodiversité du passé peut-elle nous aider à anticiper l’avenir ?

Source: The Conversation – in French – By Rodolphe Tabuce, Chargé de recherche CNRS, Université de Montpellier

Paysage typique du massif des Corbières montrant le village d’Albas et ses couches géologiques du Paléocène/Éocène. Rodolphe Tabuce, Fourni par l’auteur

Face aux grands bouleversements climatiques actuels, une question essentielle se pose : comment les animaux, et en particulier les mammifères, vont-ils répondre aux futures hausses conséquentes de température ?


Pour donner des pistes de réflexion tout en se basant sur des faits observés, on peut se tourner vers le passé, il y a environ 56 millions d’années. À cette époque, deux courts mais très intenses réchauffements climatiques sont concomitants de changements fauniques sans précédent en Europe. Nous venons de publier nos travaux dans la revue PNAS, qui permettent de mieux comprendre cette étape charnière de l’histoire des mammifères.

Un réchauffement propice aux mammifères

Le premier pic de chaleur dont nous avons étudié et synthétisé les conséquences est nommé Maximum Thermique du Paléocène-Eocène (ou PETM). Il s’agit d’un événement hyperthermique, daté à 56 millions d’années, qui a vu les températures continentales augmenter de 5 à 8 °C en moins de 20 000 ans. Évidemment, cette durée est sans commune mesure avec la rapide augmentation des températures depuis deux siècles due aux activités humaines, mais le PETM est considéré par les paléoclimatologues comme le meilleur analogue géologique au réchauffement actuel par sa rapidité à l’échelle des temps géologiques, son amplitude et sa cause : un largage massif de méthane et de CO2 dans l’atmosphère, très probablement issu d’épanchements gigantesques de basaltes sur l’ensemble de l’actuel Atlantique Nord (Groenland, Islande, Norvège, Nord du Royaume-Uni et Danemark).

Ces puissants gaz à effet de serre, et l’augmentation des températures ainsi engendrée, ont causé des bouleversements fauniques et floristiques dans tous les écosystèmes marins et terrestres. En Europe, en Asie et en Amérique du Nord, le PETM a coïncidé avec l’apparition soudaine des premiers primates (représentés aujourd’hui par les singes, les lémuriens et les tarsiers), artiodactyles (représentés aujourd’hui par les ruminants, les chameaux, les cochons, les hippopotames et les cétacés) et périssodactyles (représentés aujourd’hui par les chevaux, les zèbres, les tapirs et les rhinocéros). Cet événement a donc joué un rôle majeur, en partie à l’origine de la biodiversité que nous connaissons aujourd’hui.

Mais tout juste avant ce grand bouleversement, un autre épisode hyperthermique plus court et moins intense, nommé Pre-Onset Event du PETM (ou POE), s’est produit environ 100 000 ans plus tôt, vers 56,1 millions d’années. On estime aujourd’hui que le POE a induit une augmentation des températures de 2 °C. Certains scientifiques pensent que ce premier « coup de chaud » aurait pu déclencher le PETM par effet cascade. Pour en revenir à l’évolution des paléo-biodiversités, autant l’impact du PETM sur les faunes de mammifères est relativement bien compris, autant l’impact du POE restait inconnu avant nos travaux.

Une recherche de terrain minutieuse en Occitanie

Pour répondre à cette problématique nous avons focalisé nos recherches dans le sud de la France, dans le Massif des Corbières (département de l’Aude, région Occitanie), où les couches géologiques de la transition entre le Paléocène et l’Éocène sont nombreuses et très épaisses, laissant l’espoir d’identifier le PETM, le POE et des gisements paléontologiques à mammifères datés d’avant et après les deux pics de chaleur. Autrement dit, nous avions comme objectif de décrire très clairement et objectivement les effets directs de ces réchauffements sur les faunes de mammifères.

Durant plusieurs années, nous avons donc engagé des études pluridisciplinaires, en combinant les expertises de paléontologues, géochimistes, climatologues et sédimentologues. De plus, via des actions de sciences participatives, nous avons impliqué dans nos recherches de terrain (prospections et fouilles paléontologiques) des amateurs en paléontologie, des naturalistes et autres passionnés du Massif des Corbières. Nos travaux ont abouti à la découverte d’une faune de mammifères sur le territoire de la commune d’Albas. Cette faune est parfaitement datée dans le très court intervalle de temps entre le POE et le PETM. Dater un site paléontologique vieux de plus de 56 millions d’années avec une précision de quelques milliers d’années est tout simplement remarquable. Les scénarios qui en découlent, en particulier ceux relatifs à l’histoire des mammifères (date d’apparition des espèces et leurs dispersions géographiques) sont ainsi très précis.

Étude des couches géologiques et échantillonnage de roches pour la datation du gisement d’Albas
Étude des couches géologiques et échantillonnage de roches pour la datation du gisement d’Albas.
Rodolphe Tabuce, Fourni par l’auteur

La datation du gisement fossilifère découvert à Albas a été réalisée par analyse isotopique du carbone organique contenu dans les couches géologiques. Les roches sédimentaires (calcaires, marnes et grès) que l’on rencontre dans la nature actuelle proviennent de l’accumulation de sédiments (sables, limons, graviers, argiles) déposés en couches superposées, appelées strates. À Albas, les sédiments rencontrés sont surtout des marnes, entrecoupées de petits bancs de calcaires et de grès. Il faut imaginer ce « mille-feuille géologique » comme les pages d’un livre : elles nous racontent une histoire inscrite dans le temps. Ce temps peut être calculé de différentes manières. Alors que l’archéologue utilisera le carbone 14, le géologue, le paléoclimatologue et le paléontologue préféreront utiliser, par exemple, le rapport entre les isotopes stables du carbone (13C/12C). Cette méthode à un double intérêt : elle renseigne sur la présence d’évènements hyperthermiques lors du dépôt originel des sédiments (plus le ratio entre les isotopes 13C/12C est négatif et plus les températures inférées sont chaudes) et elle permet de donner un âge précis aux strates, puisque les événements hyperthermiques sont des épisodes brefs et bien datés. L’augmentation soudaine de 12C dans l’atmosphère durant les événements hyperthermiques est expliquée par la libération rapide d’anciens réservoirs de carbone organique, naturellement enrichis en 12C, notamment par le résultat de la photosynthèse passée des végétaux. En effet, aujourd’hui comme dans le passé, les plantes utilisent préférentiellement le 12C : plus léger que le 13C, il est plus rapidement mobilisable par l’organisme.

Ainsi, POE et PETM sont identifiés par des valeurs très fortement négatives du ratio 13C/12C. La puissance de cette méthode est telle que l’on peut l’appliquer à la fois dans les sédiments d’origine océanique que dans les sédiments d’origine continentale déposés dans les lacs et les rivières comme à Albas. On peut ainsi comparer les âges des gisements fossilifères de manière très précise à l’échelle du monde entier. La faune découverte à Albas a donc pu être comparée aux faunes contemporaines, notamment d’Amérique du Nord et d’Asie dans un contexte chronologique extrêmement précis.

Une faune surprenante à Albas

La faune d’Albas est riche de 15 espèces de mammifères documentées par plus de 160 fossiles, essentiellement des restes de dents et de mandibules. Elle documente des rongeurs (le plus riche ordre de mammifères actuels, avec plus de 2000 espèces, dont les souris, rats, écureuils, cochons d’Inde, hamsters), des marsupiaux (représentés aujourd’hui par les kangourous, koalas et sarigues), mais aussi des primates, insectivores et carnassiers que l’on qualifie « d’archaïques ». Cet adjectif fait référence au fait que les espèces fossiles identifiées n’ont aucun lien de parenté direct avec les espèces actuelles de primates, insectivores (tels les hérissons, musaraignes et taupes) et carnivores (félins, ours, chiens, loutres, etc.). Dans le registre fossile, de nombreux groupes de mammifères « archaïques » sont documentés ; beaucoup apparaissent en même temps que les derniers dinosaures du Crétacé et la plupart s’éteignent durant l’Éocène, certainement face à une compétition écologique avec les mammifères « modernes », c’est-à-dire les mammifères ayant un lien de parenté direct avec les espèces actuelles. Beaucoup de ces mammifères « modernes » apparaissent durant le PETM et se dispersent très rapidement en Asie, Europe et Amérique du Nord via des « ponts terrestres naturels » situés en haute latitude (actuel Nord Groenland, Scandinavie et Détroit de Béring en Sibérie). Ces voies de passage transcontinentales sont possibles car les paysages de l’actuel Arctique sont alors recouverts de forêts denses tropicales à para-tropicales, assurant le « gîte et le couvert » aux mammifères.

Fossiles de mammifères découverts à Albas conservés dans de petits tubes de verre. Il s’agit ici de dents minuscules d’un petit mammifère « archaïque » nommé Paschatherium.
Rodolphe Tabuce, Fourni par l’auteur

Dans la foulée de ces premières dispersions géographiques, on assiste à une diversification du nombre d’espèces chez l’ensemble des mammifères « modernes » qui vont très rapidement occuper tous les milieux de vie disponibles. Ainsi, en plus des groupes déjà évoqués (tels les primates arboricoles), c’est à cette période qu’apparaissent les premiers chiroptères (ou chauves-souris) adaptés au vol et les premiers cétacés adaptés à la vie aquatique. C’est pour cette raison que l’on qualifie souvent la période post-PETM de période clef de l’histoire des mammifères car elle correspond à la phase innovante de leur « radiation adaptative », c’est-à-dire à leur évolution rapide, caractérisée par une grande diversité écologique et morphologique.

Une découverte qui change les scénarios

Mais revenons avant le PETM, plus de 100 000 ans plus tôt, juste avant le POE, durant la toute fin du Paléocène. À cette époque, nous pensions que les faunes européennes étaient composées d’espèces uniquement « archaïques » et essentiellement endémiques car cantonnées à l’Europe. Le continent est alors assez isolé des autres masses continentales limitrophes par des mers peu profondes.

La faune d’Albas a mis à mal ce scénario. En effet, elle voit cohabiter des espèces « archaïques » essentiellement endémiques avec, et c’est là la surprise, des espèces « modernes » cosmopolites ! Parmi celles-ci, les rongeurs et marsupiaux dont Albas documente les plus anciennes espèces européennes, les premières connues avec certitude dans le Paléocène. L’étude détaillée de la faune d’Albas révèle que les ancêtres directs de la plupart des espèces découvertes témoignent d’une origine nord-américaine, et en particulier au sein d’espèces connues dans l’état américain du Wyoming datées d’avant le POE. La conclusion est simple : ces mammifères n’ont pas migré depuis l’Amérique du Nord durant le PETM comme on le pensait auparavant, mais un peu plus tôt, très probablement durant le POE. Par opposition aux mammifères « archaïques » du Paléocène et « modernes » de l’Éocène, nous avons donc qualifié les mammifères d’Albas de « précurseurs ». Ces mammifères « précurseurs », comme leurs cousins « modernes » 100 000 ans plus tard au PETM, ont atteint l’Europe via les forêts chaudes et humides situées sur l’actuel Groenland et Scandinavie. Quelle surprise d’imaginer des marsupiaux américains arrivant en Europe via l’Arctique !

Nos prochaines études viseront à documenter les faunes européennes juste avant le POE afin de mieux comprendre les impacts qu’a pu avoir cet événement hyperthermique, moins connu que le PETM, mais tout aussi déterminant pour l’histoire de mammifères. Pour revenir à notre hypothèse de départ – l’idée d’une analogie entre la biodiversité passée et celle du futur – il faut retenir de nos recherches que le POE a permis une grande migration de mammifères américains vers l’Europe grâce à une hausse des températures d’environ 2 °C. Cela pourrait nous offrir des pistes de réflexion sur l’avenir de la biodiversité européenne dans le contexte actuel d’un réchauffement similaire.


Le projet EDENs est soutenu par l’Agence nationale de la recherche (ANR), qui finance en France la recherche sur projets. Elle a pour mission de soutenir et de promouvoir le développement de recherches fondamentales et finalisées dans toutes les disciplines, et de renforcer le dialogue entre science et société. Pour en savoir plus, consultez le site de l’ANR.


The Conversation

Rodolphe Tabuce a reçu des financements de l’Agence nationale de la recherche (ANR).

ref. Réchauffements climatiques il y a 56 millions d’années : la biodiversité du passé peut-elle nous aider à anticiper l’avenir ? – https://theconversation.com/rechauffements-climatiques-il-y-a-56-millions-dannees-la-biodiversite-du-passe-peut-elle-nous-aider-a-anticiper-lavenir-260130

Pourquoi avons-nous un coccyx et pas une queue ?

Source: The Conversation – in French – By Jean-François Bodart, Professeur des Universités, en Biologie Cellulaire et Biologie du Développement, Université de Lille

Nous faisons partie d’une des très rares espèces de mammifères à ne pas avoir de queue. Harshit Suryawanshi/Unsplash, CC BY

L’absence de queue chez l’humain et les grands singes constitue une des évolutions anatomiques les plus intrigantes. La majorité des mammifères arbore une queue fonctionnelle mais les hominoïdes (humains, gorilles, chimpanzés, etc.) ne possèdent qu’un vestige : le coccyx.


Cette particularité peut paraître d’autant plus surprenante qu’il est possible de voir une queue sur l’embryon humain. Tous les embryons humains développent temporairement une queue entre la quatrième et la huitième semaine de gestation, qui disparaît bien avant la naissance. Des travaux en génétique révèlent les mécanismes moléculaires à l’origine de la perte de la queue.

Des traces virales dans l’ADN humain

L’ADN conserve dans ses séquences la mémoire des grandes transitions et des bouleversements qui ont façonné la vie au fil du temps, où chaque fragment d’ADN raconte une étape de notre histoire biologique.

De 8 à 10 % du génome humain provient de virus anciens qui ont infecté nos ancêtres il y a des millions d’années. Par exemple, les rétrovirus endogènes sont les vestiges de virus ancestraux qui se sont intégrés dans l’ADN et ont été transmis de génération en génération. Certaines de ces séquences virales ont longtemps été considérées comme de l’« ADN poubelle ». Cet ADN poubelle désigne l’ensemble des séquences du génome qui ne codent pas pour des protéines et dont la fonction biologique était initialement jugée inexistante ou inutile. En réalité, certains de ces virus ont joué des rôles clés dans notre biologie, notamment lors du développement embryonnaire. Ils ont par exemple permis la formation du placenta via l’expression de protéines nécessaire au développement et au fonctionnement de cet organe.

D’autres éléments viraux, appelés gènes sauteurs ou éléments transposables qui sont des séquences d’ADN mobiles capables de se déplacer ou de se copier dans le génome, influencent l’expression des gènes voisins. Ces éléments régulent par exemple des gènes clés lors du développement embryonnaire des organes reproducteurs chez la souris, en s’activant de manière spécifique selon le sexe et le stade de développement.


Tous les quinze jours, de grands noms, de nouvelles voix, des sujets inédits pour décrypter l’actualité scientifique et mieux comprendre le monde. Abonnez-vous gratuitement dès aujourd’hui !


Une insertion virale à l’origine de la perte de la queue

Il y a 25 millions d’années, un élément transposable s’est inséré dans le gène TBXT des ancêtres hominoïdes. Le gène TBXT (ou Brachyury) joue un rôle central dans la formation de la chorde, une structure embryonnaire essentielle au développement de la colonne vertébrale et de l’axe corporel. Chez les vertébrés, ce gène régule la différenciation des cellules qui donneront naissance aux muscles, aux os et au système circulatoire. Des mutations de TBXT ont été identifiées chez des animaux à queue courte ou absente, comme le chat Manx et des moutons développant des anomalies vertébrales. Chez l’humain, des mutations de TBXT sont liées à des malformations comme le spina bifida. Ces malformations touchent le développement de la colonne vertébrale et de la moelle épinière : les vertèbres ne se referment pas complètement dans leur partie dorsale autour de la moelle, laissant parfois une partie du tissu nerveux exposé.

Articulé avec le sacrum, le coccyx est une pièce osseuse située à l’extrémité inférieure de la colonne vertébrale, qui constitue donc un vestige de la queue des mammifères. La mutation de TBXT altérerait la conformation de la protéine, perturbant ses interactions avec des voies de signalisation moléculaire qui régulent par exemple la prolifération cellulaire et la formation des structures à l’origine des vertèbres. L’introduction chez la souris d’une mutation du gène TBXT identique à celles dans la nature a permis d’observer des animaux à queue courte et dont le développement embryonnaire est perturbé (6 % des embryons développent des anomalies similaires au spina bifida). L’étude montre que la mutation TBXT modifie l’activité de plusieurs gènes de la voie Wnt, essentiels à la formation normale de la colonne vertébrale. Des expériences sur souris montrent que l’expression simultanée de la forme complète et de la forme tronquée du produit du gène induit une absence totale de queue ou une queue raccourcie, selon leur ratio.

Ces travaux expliquent pourquoi les humains et les grands singes ont un coccyx au lieu d’une queue fonctionnelle. L’insertion de cette séquence d’ADN mobile, ou élément transposable, a agi comme un interrupteur génétique : elle désactive partiellement TBXT, stoppant le développement de la queue tout en permettant la formation du coccyx.

Un compromis évolutif coûteux ?

La perte de la queue a marqué un tournant évolutif majeur pour les hominoïdes. En modifiant le centre de gravité, elle aurait facilité l’émergence de la bipédie, permettant à nos ancêtres de libérer leurs mains pour manipuler des outils ou porter de la nourriture. Mais cette adaptation s’est accompagnée d’un risque accru de malformations congénitales, comme le spina bifida, qui touche environ 1 naissance sur 1 000.

Si des mutations du gène TBXT sont impliquées, d’autres facteurs de risques ont été aussi identifiés, comme les carences nutritionnelles (un manque d’acide folique (vitamine B9) chez la mère), la prise de médicaments anti-épileptiques (valproate), le diabète, l’obésité, les modes de vie liés à la consommation de tabac ou d’alcool. Plus récemment, une étude a montré qu’une exposition élevée aux particules PM10 (particules inférieures à 10 microns) pendant la grossesse augmente le risque de 50 % à 100 % le développement d’un spina bifida.

Ces résultats illustrent une forme de compromis évolutif : la disparition de la queue, avantageuse pour la bipédie, a été favorisée tandis qu’un risque accru de malformations vertébrales est resté « tolérable ». Aujourd’hui, le coccyx incarne ce paradoxe d’un avantage conservé au prix de la vulnérabilité : utile pour fixer des muscles essentiels à la posture et à la continence (soutien du plancher pelvien), il reste un vestige « fragile ». Les chutes peuvent le fracturer.

En conclusion, le coccyx des hominoïdes illustre un paradoxe évolutif : une mutation virale ancienne a sculpté leurs anatomies, mais a aussi créé des vulnérabilités. Des fragments d’ADN, venus de virus anciens, sont devenus au fil de l’évolution des rouages essentiels du développement embryonnaire : ils accélèrent la croissance, coordonnent la spécialisation des cellules et régulent l’expression des gènes au moment opportun.

The Conversation

Jean-François Bodart ne travaille pas, ne conseille pas, ne possède pas de parts, ne reçoit pas de fonds d’une organisation qui pourrait tirer profit de cet article, et n’a déclaré aucune autre affiliation que son organisme de recherche.

ref. Pourquoi avons-nous un coccyx et pas une queue ? – https://theconversation.com/pourquoi-avons-nous-un-coccyx-et-pas-une-queue-256735

What makes a good AI prompt? Here are 4 expert tips

Source: The Conversation – Global Perspectives – By Sandra Peter, Director of Sydney Executive Plus, Business School, University of Sydney

FOTOSPLASH/Shutterstock

“And do you work well with AI?”

As tools such as ChatGPT, Copilot and other generative artificial intelligence (AI) systems become part of everyday workflows, more companies are looking for employees who can answer “yes” to this question. In other words, people who can prompt effectively, think with AI, and use it to boost productivity.

In fact, in a growing number of roles, being “AI fluent” is quickly becoming as important as being proficient in office software once was.

But we’ve all had that moment when we’ve asked an AI chatbot a question and received what feels like the most generic, surface level answer. The problem isn’t the AI – you just haven’t given it enough to work with.

Think of it this way. During training, the AI will have “read” virtually everything on the internet. But because it makes predictions, it will give you the most probable, most common response. Without specific guidance, it’s like walking into a restaurant and asking for something good. You’ll likely get the chicken.

Your solution lies in understanding that AI systems excel at adapting to context, but you have to provide it. So how exactly do you do that?

Crafting better prompts

You may have heard the term “prompt engineering”. It might sound like you need to design some kind of technical script to get results.

But today’s chatbots are great at human conversation. The format of your prompt is not that important. The content is.

To get the most out of your AI conversations, it’s important that you convey a few basics about what you want, and how you want it. Our approach follows the acronym CATS – context, angle, task and style.

Context means providing the setting and background information the AI needs. Instead of asking “How do I write a proposal?” try “I’m a nonprofit director writing a grant proposal to a foundation that funds environmental education programs for urban schools”. Upload relevant documents, explain your constraints, and describe your specific situation.

Angle (or attitude) leverages AI’s strength in role-playing and perspective-taking. Rather than getting a neutral response, specify the attitude you want. For example, “Act as a critical peer reviewer and identify weaknesses in my argument” or “Take the perspective of a supportive mentor helping me improve this draft”.

Task is specifically about what you actually want the AI to do. “Help me with my presentation” is vague. But “Give me three ways to make my opening slide more engaging for an audience of small business owners” is actionable.

Style harnesses AI’s ability to adapt to different formats and audiences. Specify whether you want a formal report, a casual email, bullet points for executives, or an explanation suitable for teenagers. Tell the AI what voice you want to use – for example, a formal academic style, technical, engaging or conversational.

A person typing into a chatbot on their mobile phone.
In a growing number of roles, being able to use AI is quickly becoming as important as being proficient in office software once was.
Shutterstock

Context is everything

Besides crafting a clear, effective prompt, you can also focus on managing the surrounding information – that is to say on “context engineering”. Context engineering refers to everything that surrounds the prompt.

That means thinking about the environment and information the AI has access to: its memory function, instructions leading up to the task, prior conversation history, documents you upload, or examples of what good output looks like.

You should think about prompting as a conversation. If you’re not happy with the first response, push for more, ask for changes, or provide more clarifying information.

Don’t expect the AI to give a ready-made response. Instead, use it to trigger your own thinking. If you feel the AI has produced a lot of good material but you get stuck, copy the best parts into a fresh session and ask it to summarise and continue from there.

Keeping your wits

A word of caution though. Don’t get seduced by the human-like conversation abilities of these chatbots.

Always retain your professional distance and remind yourself that you are the only thinking part in this relationship. And always make sure to check the accuracy of anything an AI produces – errors are increasingly common.

AI systems are remarkably capable, but they need you – and human intelligence – to bridge the gap between their vast generic knowledge and your particular situation. Give them enough context to work with, and they might surprise you with how helpful they can be.

The Conversation

The authors do not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.

ref. What makes a good AI prompt? Here are 4 expert tips – https://theconversation.com/what-makes-a-good-ai-prompt-here-are-4-expert-tips-260502

Avoid bad breath, don’t pick partners when drunk: ancient dating tips to find modern love

Source: The Conversation – Global Perspectives – By Konstantine Panegyres, Lecturer in Classics and Ancient History, The University of Western Australia

Henryk Siemiradzki via Wikimedia Commons

To love and be loved is something most people want in their lives.

In the modern world, we often see stories about the difficulties of finding love and the trials of dating and marriage. Sometimes, the person we love doesn’t love us. Sometimes, we don’t love the person who loves us.

Ancient Greeks and Romans also had a lot to say about this subject. In fact, most of the issues people face today in their search for love are already mentioned in ancient Greek and Roman literature.

So, what did they say? And is the advice they put forward still relevant for modern people?

Advice for finding a lover

The Roman poet Ovid (43BCE–17CE) wrote a poem called The Art of Love (Ars Amatoria). In it, he offered advice for those who are still single.

First, Ovid says, you should make an effort to find someone you’re interested in. Your lover “will not come floating down to you through the tenuous air, she must be sought”.

As suitable places to find a lover, Ovid recommends walking in porticos and gardens, attending the theatre, or (surprisingly enough) lingering near law courts.

You need to catch someone’s eye and then invent an excuse to talk with them, he says.

Seek your lover in the daytime, says Ovid. Be careful of the night. You won’t choose the right person if you’re drunk. And you can’t see their face properly if it’s too dark – they might be uglier than you think.

Second, Ovid says you need to look presentable. Make sure your clothes are clean and you have a good haircut. Moreover, keep yourself groomed properly at all times:

Do not let your nails project, and let them be free of dirt; nor let any hair be in the hollow of your nostrils. Let not the breath of your mouth be sour and unpleasing.

Ovid’s The Art of Love may be regarded as a kind of love manual. But aside from making personal efforts to find a lover, people could also use matchmakers.

However, matchmaking was a difficult process. Sometimes matchmakers didn’t tell the truth about the situations of the parties involved. So the Athenian writer Xenophon (430–353 BCE) says people were sometimes “victims of deception” in the matchmaking process.

What if you’re not in love?

The ancients recognised that not being in love can be a problem. They thought it bad for your mental and physical health, but also for society more broadly.

For example, the Roman writer Claudius Aelian (2nd–3rd century CE) in his Historical Miscellany says soldiers who are in love will fight better than soldiers who are not in love:

In the heat of battle when war brings men into combat, a man who is not in love could not match one who is. The man untouched by love avoids and runs away from the man who loves, as if he were an outsider uninitiated into the god’s rites, and his bravery depends on his character and physical strength.

According to Aelian, the Spartans had a punishment for men who did not fall in love:

Any man of good appearance and character who did not fall in love with someone well-bred was also fined, because despite his excellence he did not love anyone […] lovers’ affection for their beloved has a remarkable power of stimulating the virtues.

So, when two people are in love, they can inspire each other and bring out the best in one another. Being in love can help a person become better and achieve more.

Fighting for and keeping a lover

If we are lucky, the person we love will also love us back, and we won’t have any love rivals.

But what happens when the person we love is also loved by someone else? We may need to put in more effort to win the affection of that person, but sometimes this brings us into conflicts.

For example, the Roman orator and politician Marcus Tullius Cicero (106–43 BCE), in his On the Orator, tells how Gaius Memmius, Roman tribune of the year 111 BCE, apparently took a bite out of his love rival’s arm, “when he had a quarrel with him at Tarracina over a girlfriend”.

Some ways to keep one’s lover interested that are mentioned in ancient sources include showing off one’s wealth.

For example, in one of the plays of the poet Alexis (375–275 BCE) a young man who is in love puts on a large banquet to impress his girlfriend with a display of wealth. Engagements were at that time sometimes cancelled if it turned out the husband was too poor.

Of course, things did not always work out, and people had grievances against former lovers. One particularly famous invective was from the poet Martial (38–104 CE) to a woman called Manneia:

Manneia, your little dog licks your face and lips. Small wonder that a dog likes eating dung!

Timeless concerns

Today, we often see debates about whether it’s better to stay single or get into a relationship.

The same goes for antiquity. In the 4th-century BCE play Arrephoros or The Pipe Girl by poet Menander, one character says:

If you’ve got any sense, you won’t get married […] I’m married myself – which is why I’m advising you not to do it.

Others lamented that they missed their opportunity for love. So the poet Pindar (6th–5th century BCE) wrote a poem regretting that he could not make the much younger Theoxenus his boyfriend:

You should have picked love’s flowers at the right time, my heart, when you were young. But as for the sparkling rays from Theoxenus’ eyes, whoever looks on them and is not roiled with longing has a black heart forged with cold fire out of steel or iron.

Clearly, finding a lover was as difficult then as it is now.

The Conversation

Konstantine Panegyres does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Avoid bad breath, don’t pick partners when drunk: ancient dating tips to find modern love – https://theconversation.com/avoid-bad-breath-dont-pick-partners-when-drunk-ancient-dating-tips-to-find-modern-love-250792

What is rejection sensitive dysphoria in ADHD? And how can you manage it?

Source: The Conversation – Global Perspectives – By Victoria Barclay-Timmis, Adjunct Lecturer in Psychology, University of Southern Queensland

Vitalii Khodzinskyi/Unsplash

Imagine your friend hasn’t replied to a message in a few hours. Most people might think, “they are probably just busy”.

But someone with attention-deficit hyperactivity disorder (ADHD) might spiral into a flood of thoughts like, “they must hate me!” or “I’ve ruined the friendship!”

These intense emotional reactions to real or imagined rejection are part of what’s called rejection sensitive dysphoria.

The term isn’t a formal diagnosis, but it’s gaining traction in both research and clinical work, especially among adults seeking to understand themselves better.

So, what is rejection sensitive dysphoria, how does it relate to ADHD, and how can we handle it with more compassion?

It’s more than just disliking criticism

Everyone feels hurt when they’re criticised or left out. But rejection sensitivity dysphoria isn’t just about “not liking” feedback. The word dysphoria refers to intense emotional distress.

People with rejection sensitivity dysphoria describe overwhelming reactions to perceived rejection, even if no one actually said or did anything cruel.

A passing comment such as “I thought you were going to do it this way” can trigger feelings of shame, embarrassment or self-doubt.

The emotional pain often feels immediate and consuming, leading some people to withdraw, over-apologise or lash out to protect themselves.

The ADHD brain and emotional hypersensitivity

ADHD is often associated with attention or impulsivity, but one major (and often overlooked) component is emotional dysregulation: difficulty managing and recovering from strong emotional responses.

This isn’t a character flaw; it’s a neurological difference. Brain imaging studies show people with ADHD tend to have differences in how their amygdala (the brain’s emotional alarm system) and prefrontal cortex (which regulates impulses and emotions) work together.

Brain graphic showing the amygdala and prefrontal cortex
The amygdala is the brain’s emotional alarm system. The prefrontal cortex regulates emotions.
chaiyo12/Shutterstock

The result? Emotional experiences hit harder and take longer to settle.

A 2018 study highlights this imbalance in emotional control circuits in people with ADHD, explaining why intense feelings can seem to “take over” before logical thinking kicks in.

What does the research say?

Recent research from 2024 reports a strong link between ADHD symptoms and rejection sensitivity. It found students with higher ADHD symptom levels also reported significantly more rejection sensitivity, including a heightened fear of being negatively evaluated or criticised.

Further evidence comes from a 2018 study which showed adolescents with ADHD symptoms were far more sensitive to peer feedback than their peers. Their brain activity revealed they were more emotionally reactive to both praise and criticism, suggesting they may perceive neutral social cues as emotionally charged.

This reflects what I see daily in my clinic. One 13-year-old boy I work with is creative, empathetic and full of potential, yet social anxiety tied to a deep fear of rejection often holds him back. He once told me, “if I say no, they won’t like me anymore”. That fear drives him to go along with things he later regrets, simply to keep the peace and avoid losing connection.

This constant social hypervigilance is mentally draining. Without support, it can spiral into shame, low confidence and ongoing mental health struggles.




Read more:
Parents are increasingly saying their child is ‘dysregulated’. What does that actually mean?


Adults with ADHD aren’t immune either. A 2022 study explored how adults with ADHD experience criticism and found many linked it to persistent feelings of failure, low self-worth and emotional reactivity – even when the criticism was constructive or mild.

One client I support – a high-achieving professional diagnosed in her 50s – described learning about rejection sensitive dysphoria as “finding the missing piece of the puzzle”.

Despite consistently excelling in every role, she had long felt anxious about how she was perceived by colleagues. When she received a minor, formal complaint at work, she spiralled into intense self-doubt and shame.

Instead of brushing it off, she thought: “I’m too much”. This belief
had been silently reinforced for years by her emotional sensitivity to feedback.

What helps?

If you experience rejection sensitivity dysphoria, you’re not alone, and you’re not broken.

Here are some tools that may help:

  • name it. Saying to yourself, “This feels like rejection sensitivity,” can give you distance from the emotional flood

  • pause before reacting. Taking slow breaths, counting backwards, or stepping outside are simple grounding strategies that help calm the body’s stress response and restore balance to your nervous system. Research shows slowing your breath and grounding your senses can help shift your body out of fight-or-flight mode, supporting clearer thinking and emotional regulation

  • challenge the story. Ask yourself, “What else could be true?” or “How would I speak to a friend feeling this way?”

  • consider therapy. Working with a psychologist who understands ADHD and rejection sensitivity dysphoria can help untangle these reactions and develop healthy, self-compassionate responses. The Australian Psychological Society has a Find a Psychologist service: you can search by location, areas of expertise (such as anxiety, ADHD, trauma) and the type of therapy you’re interested in

  • start early with kids. Helping children with ADHD learn emotional language, boundary-setting and resilience can prevent rejection sensitivity from becoming overwhelming. For parents, resources such as Raising Children Network and books like The Whole-Brain Child by Daniel Siegel and Tina Payne Bryson offer practical ways to teach these skills at home

  • communicate gently. If you work or live with someone who has ADHD, try to give feedback clearly and kindly. Avoid sarcasm or vague phrasing. A little extra clarity can go a long way.

Rejection sensitivity dysphoria isn’t about being fragile or “weak”. It’s about how the ADHD brain processes emotional and social cues. With insight, tools and support, these experiences can become manageable.

The Conversation

Victoria Barclay-Timmis is a clinical psychologist and works in private practice.

ref. What is rejection sensitive dysphoria in ADHD? And how can you manage it? – https://theconversation.com/what-is-rejection-sensitive-dysphoria-in-adhd-and-how-can-you-manage-it-259995

Sleep divorce: could sleeping separately from your partner lead to a better night’s rest?

Source: The Conversation – Global Perspectives – By Alix Mellor, Research Fellow, Psychology, Monash University

Cemile Bingol/Getty Images

Hundreds of years ago, it was common for married couples among the European upper classes to have separate bedrooms. Sleeping separately was a symbol of luxury and status historically reserved for royalty and the very wealthy.

Nowadays, it’s common for married couples and other couples in relationships to sleep in the same bed. But sometimes – for reasons from conflicting schedules to snoring to sleep talking – couples might choose to sleep separately in pursuit of a better night’s sleep.

This is known as “sleep divorce”. Though I prefer the term “sleep separation”, as this doesn’t have to be a permanent arrangement – but more on that later.

So why might couples choose to sleep separately? And what does the evidence say about the effects on sleep quality if you sleep alone versus with a partner?

Why do couples opt for a sleep separation?

Couples may choose to sleep apart if one partner’s sleep is disturbing the other’s, or both are disrupting one another. This can happen for a variety of reasons.

These include waking up frequently in the night, mismatched body clocks (for example, one person coming to bed later than the other), conflicting schedules (for example, shift workers), snoring, twitching legs or sleep talking.

Parents with babies and young children may choose to sleep separately to avoid both partners’ sleep being disturbed.

Those with conflicting preferences for sleeping environments, such as one partner liking a cool room with a fan and the other preferring warmth, may also decide to sleep apart.

What are the benefits of sleeping alone?

Many couples say they prefer to sleep – and sleep better – next to their partner.

But when scientists measure sleep objectively, such as via an electroencephalogram (EEG) to assess brain waves, the data actually shows poorer sleep quality when co-sleeping. So sleeping alone may, in fact, mean better quality and longer sleep.

Research also shows when one member of the couple has a sleep disorder, such as insomnia or sleep apnoea (where breathing is frequently interrupted during sleep), these people often inadvertently wake up their partner when they wake in the night. So sleeping alone could be a good idea if your bed partner has a sleep disorder.

What’s more, studies have found sleep disturbances are linked to reduced relationship satisfaction. So sleeping apart could actually mean happier couples.

Finally, anyone who has struggled with their sleep will know anxiety around sleep is common. Many clients I have seen who experience insomnia report sleeping alone can alleviate some of their anxiety because at least they know they won’t disturb, or be disturbed by, their partner.

A birds-eye-view of a couple turned away from each other in bed.
Disturbed sleep has been linked to lower relationship satisfaction.
Gorodenkoff/Shutterstock

Are there any downsides to separate sleeping arrangements?

Some people dislike sleeping alone, reporting comfort, and feelings of safety and protection when sleeping alongside their partner – and loneliness when they don’t.

Sleeping separately also requires two rooms, or at least two beds. Many couples may not have these options available to them in their home.

Sleeping separately is often stigmatised, with some people seeing it as the death of a couple’s sex life. But while sleeping in separate beds may provide fewer opportunities for sex, this doesn’t necessarily mean the end of intimacy.

Sleeping apart could mean some couples actually have more sex. We know better sleep is linked to more positive feelings about relationships, so it’s possible the desire to be intimate could increase after a good night’s sleep in separate beds. Sleeping apart may even mean some couples have more energy to be intimate.

Nonetheless, if you choose to sleep separately from your partner, it’s important to have an open discussion and prioritise opportunities for connection and intimacy. One client I worked with referred to “visiting rights” where her partner came into her bed for a short period before sleep or in the morning.

Who should potentially consider a sleep separation?

You may wish to think about a “sleep separation” if you are disturbing each other’s sleep, have young children, or have different preferences in terms of temperature, light and noise, which are causing issues.

Ultimately, if sleeping in the same bed is leading to poor sleep then sleeping apart, if it’s possible, could help.

If you can’t sleep separately there may be other ways to reduce disturbance from a partner such as using an eye mask, white noise or earplugs.

If you decide to try a sleep separation, remember this can be a flexible arrangement or “re-set” and doesn’t have to be permanent, or every night. Some couples find sleeping separately during the working week but sharing a bed on the weekend works well for them.

Lastly, it’s important to talk to your GP about any persistent sleep problems, such as snoring, insomnia, or unusual behaviour during sleep (for example, shouting or walking around), as there may be an underlying sleep disorder which needs treating.

The Conversation

Alix Mellor works for the Monash University Healthy Sleep Clinic at the Turner Clinics as a provisional psychologist.

ref. Sleep divorce: could sleeping separately from your partner lead to a better night’s rest? – https://theconversation.com/sleep-divorce-could-sleeping-separately-from-your-partner-lead-to-a-better-nights-rest-258085

If you have a pet as a kid, does this lower your risk of asthma and eczema?

Source: The Conversation – Global Perspectives – By Samantha Chan, Immunology and Allergy Lead, Snow Centre for Immune Health, WEHI (Walter and Eliza Hall Institute of Medical Research)

Catherine Delahaye/Getty Images

As the number of people with allergies grows worldwide, scientists are trying to work out precisely how and why these conditions – such as asthma and eczema – develop.

One long-standing idea is the “hygiene hypothesis”. This suggests our modern indoor lifestyles are to blame, as they limit our early exposure to germs and allergens which help train the immune system.

But growing evidence suggests having a pet may counter this effect. As any pet owner knows, our furry friends bring a lot of mess, germs and fur into our homes – along with the cuddles.

So, does spending time with animals lower children’s risk of allergies? Here’s what we know.

How allergies develop

During early childhood, our immune systems learn what to attack and what to ignore to stop us getting sick.

Evidence suggests early exposure – to family members, food, germs, dust, dirt, pollen and pet dander (skin flakes) – shapes this immune response.

Allergic conditions develop when the immune system overreacts to harmless substances, such as dust, pollen or certain foods. These reactions can affect the skin, airways and gut.

Big fluffy dog nuzzles baby in colourful jumpsuit.
Dogs bring both love and mess – which might be just what a developing immune system needs.
Samantha Chan/Author provided, CC BY-NC-ND

However, we still don’t fully understand why some people develop allergies while others don’t.

Scientists have identified genes linked to allergic conditions. But most have subtle effects on the immune system and act as “risk factors” – they increase the chance of disease but don’t cause it outright.

Recent research suggests exposure to bacteria in our environment could be another major factor.

From birth, our bodies are colonised by bacteria, especially in the gut. This community of microorganisms is known as the microbiome.

Ongoing “crosstalk” between the microbiome and immune system is crucial for healthy immune function. When this balance is disturbed, it can contribute to inflammation and disease.

The effect of our early environment

In the last few decades, studies of children raised on farms gave us some of the first clues that early environments can affect allergy risk.

Compared to children raised in cities, children on farms are less likely to have allergic conditions such as eczema and asthma. This is especially true of those in close contact with animals.

Notably, farm-raised children tend to develop a more diverse microbiome than children raised in urban environments. This may help make their immune system more tolerant to foreign substances (such as bacteria and dirt) and less likely to develop allergies.

However, across the world children are increasingly living in urban areas.

This means a pet may be the closest contact they have with animals. So, does this still lower their risk of developing allergies?

Close-up of boarder collie sheep dog protecting herd in field.
Children raised on farms, especially those in close contact with animals, seem to have a lower risk of allergic diseases.
Peter van Haastrecht / 500px/Getty Images

What the studies show in eczema

Some studies indicate children with pets may be less likely to have allergies.

However this evidence hasn’t always been easy to interpret.

It can be difficult to tell whether lower allergy rates are due to the pets themselves or other factors, such as location, lifestyle or a family history of allergies.

A review of results from 23 studies found children exposed to dogs early in life were significantly less likely to develop eczema.

Another 2025 study analysed genetic data from more than 270,000 people. It found a gene linked to eczema only increased risk of eczema in children who hadn’t been exposed to dogs.

This suggests early dog exposure may help protect children who are genetically more likely to develop eczema.

What about asthma?

When it comes to asthma, the story gets trickier.

One 2001 study followed more than 1,000 children in the United States from birth to age 13. It found those living with dogs indoors were less likely to develop frequent wheezing – a common asthma symptom – but only if they didn’t have a family history of asthma.

A Korean study from 2021 found those who had dogs during childhood were less likely to develop allergies. But they had a slightly higher risk of non-allergic wheeze — a type of breathing difficulty usually caused by airway irritation or infections (not allergens).

This suggests while growing up with a dog may protect against allergic conditions, such as asthma, it may increase the chance of certain non-allergic respiratory symptoms.

What about cats?

It’s challenging to tease apart the specific effects of cats versus dogs, since many early studies grouped all furry pets together.

But in studies that have looked at them separately, living with cats didn’t seem to reduce allergy risk.

One potential reason is cats and dogs carry very different microbes, which may influence how they shape the household environment.

A boy holds up his cat.
Cats and dogs carry very different microbes, which may influence how they shape the household environment.
Photo by Mochamad Reza Aditya on Unsplash

So, should you get a pet?

If you’re already thinking about getting a dog, there’s decent evidence early exposure could reduce your child’s risk of eczema, and possibly other allergic conditions too.

It’s not a guarantee, but a potential bonus – alongside companionship, joy and never having to worry about what to do with leftovers.

And if a dog’s not on the cards, don’t worry. Spending time outdoors, encouraging messy play, and avoiding overuse of disinfectants can all help build a more resilient immune response.

The Conversation

Samantha Chan has served on advisory boards for CSL Behring. She is in receipt of funding from the Allergy and Immunology Foundation Australia and Walter & Eliza Hall Institute. She is affiliated with the Australasian Society of Clinical Immunology and Allergy, American Academy of Allergy, Asthma, and Immunology and European Academy of Allergy and Clinical Immunology. She is a physician for the Snow Centre for Immune Health, funded by the Snow Medical Research Foundation.

In the past five years, Jo Douglass has served on advisory boards, provided advice or undertaken presentations on behalf of Astra-Zeneca P/L, GSK, CSL, Stallergenes, Immunosis P/L , Novartis and Sanofi. She is in receipt of funding from the Medical Research Future Fund for studies in allergic asthma. She is a clinical co-director of the Snow Centre for Immune Health, funded by the Snow Medical Research Foundation.

ref. If you have a pet as a kid, does this lower your risk of asthma and eczema? – https://theconversation.com/if-you-have-a-pet-as-a-kid-does-this-lower-your-risk-of-asthma-and-eczema-258581

‘Next time bring my daughter’: Barbara Demick reunited a Chinese family with the stolen ‘missing twin’ adopted in the US

Source: The Conversation – Global Perspectives – By Kathryn Shine, Associate Professor, Journalism, Curtin University

Reunited twins Esther (left) and Shuangjie Barbara Demick

At the end of a long road trip through rural China in 2009, American journalist Barbara Demick had an encounter that would change the course of her life. In the previous days, she had interviewed several parents whose children had been forcibly removed from them by government officials. Demick suspected there may be a link between the missing children and China’s booming international adoption industry.

She had enough for her story, but some instinct compelled her to follow the next lead to remote Gaofeng Village, high in the mountains of Hunan Province.

Her driver could only take her so far. The dirt road ended at a stream, where she was met by local woman Zanhua Zeng and her daughter Shuangjie. They guided her across a makeshift bridge and into the village where “everything was in the process of falling down or going up”.

Zanhua Zeng and daughter Shuangjie, meeting Barbara Demick in a moment that would change all their lives.
Barbara Demick

There, she learnt about two-year-old Fangfang, daughter of Zanhua and twin sister of Shuangjie, violently taken from her aunt’s care in 2002. Government officials had told the family they were in breach of China’s One Child Policy and were not allowed to keep the baby. They had no idea what had happened to their daughter and sister.

Zanhua’s parting words were: “Come back again and next time bring my daughter.”


Review: Daughters of the Bamboo Grove: From China to America, A True Story of Abduction, Adoption, and Separated Twins – Barbara Demick (Text)


Extraordinary consequences

At the time, Demick had no premonition of the significance the Zeng family and their story would play in her life – and those of many others. But in writing a front-page report for the Los Angeles Times about the links between China’s stolen children and international adoptions, including a small piece about the missing twin Fangfang, she started a chain of events with extraordinary consequences.

Fangfang (renamed Esther), in the referral photo supplied by the orphanage.

For Zanhua and Shuangjie, it would eventually lead to a reunion with Fangfang, accompanied by Demick, who helped organise it. She was to develop an enduring connection with the family – and with Fangfang’s adoptive American family, too.

Daughters of the Bamboo Grove does what the best stories do: humanises a big issue. In this case, China’s one child policy and the international adoption industry it created.

Demick’s book is a story of China, and of incomprehensible government control. But as told through this case of the separated twins, it’s also a story of family, identity, loss and resilience.

It’s personal and moving, but also thoroughly researched, strengthened with compelling and confronting statistics and anecdotes.

The twins’ meeting as young women was documented by Barbara Demick for the Los Angeles Times.

Demick outlines the population growth that led to the introduction of the One Child Policy in 1979 and the rise of the State Family Planning Commission, set up to enforce the law limiting most Chinese families to one child.

“Family Planning morphed into a monstrous organization that dwarfed the police and military in manpower,” she writes. “By the 1990s, it was estimated that eighty-three million Chinese worked at least part-time for Family Planning.” (By comparison, China’s combined armed forces were estimated to number roughly three million at the time.)

The organisation was “intrusive in the extreme”, with female workers having to report when they had their periods and, in some cases, show their blood-stained sanitary pads. After giving birth to their first child, women were forced to have an IUD or were sterilised.

People who violated the law received fines of two to six times their annual income. If violators were civil servants, they could lose their jobs. In rural areas, where people were less reliant on government jobs, the policy was implemented with “brute force”.

People were beaten. Sometimes their homes were demolished or set on fire. “If you violate the policy, your family will be destroyed,” read a sign on a wall not far from the Zeng’s home. Family Planning officials regularly checked even the most remote villages, sometimes tipped off by neighbours.

If a woman was discovered to be pregnant after having a child, she would be forced to undergo an abortion. The methods were “crude, often barbaric,” Demick writes. “Doctors would sometimes induce labor and then kill the baby with an injection of formaldehyde into the cranium before the feet emerged.”

Although Chinese people, particularly those from rural communities, often wanted to have bigger families, they had no power to fight the authorities. Those who tried to quietly subvert the system were ruthlessly punished.

These practices were so common, they were generally accepted. But when government officials started to take babies from families who had defied the policy, resistance grew. Other families started reporting cases like what had happened to Fangfang. Family Planning had forcibly removed children, refusing to provide any details about their whereabouts.

Officials miscalculated in 2005 when they dared to take a boy, Demick writes. He lived in a town, attended school and was not as poor as some of the other affected families. The school made a complaint, which was supported by a local politician. The boy was returned to his family after 29 days.

Hearing about this case emboldened other families to mobilise and fight back. These were among the first families Demick met when she travelled to cover the story of the missing children in 2009.

Child trafficking by ‘good Samaritans’

In the meantime, news was starting to emerge about the child trafficking of children through Chinese orphanages, with “good Samaritans” who “rescued” babies being paid increasingly large amounts of money. “The orphanages were competing with one another to procure babies,” Demick writes.

Chinese babies were in high demand for international adoption, and it had become a lucrative business. One Hunan orphanage director later told police they started a service to allow foreigners to adopt babies in 2001; they were charged a US$3,000 cash donation per baby. In some cases, the babies genuinely needed homes and families, Demick writes, but the payment was “in effect a bounty that incentivised a wave of kidnapping of female babies and toddlers”.

Shaoyang Social Welfare Institute, where Esther spent the last six months of her life in China.
Barbara Demick

It gradually became clear that many of the children removed by Family Planning officials were among the wave of Chinese babies and toddlers adopted by families from other countries, all of whom paid significant fees to do so, as well as donating to the orphanages. It was later revealed that orphanages routinely fabricated information about how and where the babies had been reportedly left.

By the time Demick’s reports were published in 2009, nearly 100,000 babies had been sent out of China, more than half to the US. The worldwide number would reach 160,000 by 2024, when China ended its international adoption program.

Demick’s story about stolen babies, plus other reports from within China and elsewhere, stunned the international adoption community and parents of Chinese adoptees around the world. Until then, China was perceived to be the most ethical choice for international adoption. For adoptive parents who now feared their adopted children could be taken from them, the revelations were terrifying, Demick says.

Marsha and Esther (background) in their Texas kitchen.
Barbara Demick

One of these parents was a Texan women named Marsha. She and her husband Al had adopted two Chinese girls: Victoria in 1999 and Esther in 2002. Through developing connections among families who had adopted from China, Demick came across Marsha – and realised Esther may be Fangfang: the missing twin.

She was correct. However, the story was far from resolved, which explains, in part, why Demick had plenty of material for her book.

Reporter as dogged detective

Daughters of the Bamboo Grove is a testament to dogged reporting. Demick’s skills as a researcher, interviewer – and effectively, a detective – imbue the book with substance and credibility.

She handles difficult subject matter sensitively, portraying the Zeng family in China and adoptive mother Marsha in the US with empathy. She acknowledges the challenges they faced and recognises their devotion to their children.

Her descriptions of the twin sisters, Shuangjie and Esther, are perceptive and gentle. Restraint is a powerful writing tool and Demick uses it here to great effect.

This is the moment where the twins first meet, outside the Zeng family home in China:

When everybody was out of the van, the two of them stood next to each other, side by side, facing the photographer. Nobody embraced. Nobody spoke. I imagined the twins as bride and groom in an arranged marriage, meeting for the first time, willing to pose for the photographer but not yet able to engage in conversation.

a girl in a beanie is getting out of a van, with her twin looking at her, smiling, in a parka
Twins Esther (left) and Shaungjie, separated most of their lives, meet for the first time since babyhood.
Barbara Demick

Demick came to this story with the perspectives and limitations of an American journalist, but has gone to remarkable lengths to hear and convey the voices of Chinese people impacted by the One Child Policy.

At the same time, she challenges Western paternalistic ideas around adoption, questioning the view expressed by many she encounters that the Chinese children adopted by Westerners were lucky, guaranteed to have better lives elsewhere.

China’s One Child Policy was not formally abolished until 2015. In its 35 years, it did almost unimaginable damage, concludes Demick:

the policy shattered marriages, led to the deaths of countless children and suicides of parents, and left China with a population expected to continue declining into the next century. It was all encompassing, leaving almost everyone a victim or perpetrator or both.

For the hundreds of thousands of children sent out of China during this period, the legacy of One Child endures. As Demick writes, they are

citizens of their adopted countries but tethered by blood to another family and country they struggle to comprehend. Living in this in-between space between worlds.

In dedicating Daughters of the Bamboo Grove to Chinese adoptees around the world, Demick says she hopes in some small way it helps them to understand where they came from, and how they got to where they are today.

The Conversation

Kathryn Shine does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. ‘Next time bring my daughter’: Barbara Demick reunited a Chinese family with the stolen ‘missing twin’ adopted in the US – https://theconversation.com/next-time-bring-my-daughter-barbara-demick-reunited-a-chinese-family-with-the-stolen-missing-twin-adopted-in-the-us-259993

Greek and Roman nymphs weren’t just sexy nature spirits. They had other important jobs too

Source: The Conversation – Global Perspectives – By Kitty Smith, PhD Candidate in Classical Greek and Roman History, University of Sydney

Acteon, having accidentally seen the goddess Diana and her nymphs bathing, begins to change into a stag. Metropolitan Museum of Art, Gift of Mrs. George S. Amory, Object Number: 64.208.

Could you ever be truly alone in the woods of ancient Greece or Rome? According to myth, the ancient world was filled with wild animals, terrifying monsters, and mischievous deities. Among them were nymphs: semi-divine female figures that personified elements of the natural world.

But nymphs offer us more than just stories of sexy nature spirits.

They can reveal how ancient people thought about their world and connected with their landscape through mythology.

Personifying elements of nature

Nymph was a broad category in myth. It encompassed almost every semi-divine woman and girl in myth, including a number of goddesses. The sea goddess Thetis and the underworld river Styx were both sea nymphs as well as goddesses.

Nymphs were typically portrayed as young, exceptionally beautiful women in art and literature. The word “nymph” in ancient Greek could even be used to mean “young girl” or “unmarried woman” when applied to mortal women.

Despite this etymological connection, many nymphs were married or mothers or gods. Amphitrite was the wife of Poseidon, and her sister Metis, the personification of wisdom, was Zeus’ first wife, according to Hesiod’s Theogony. Maia was the mother of Hermes, the messenger god.

What links all nymphs was their connection with the natural world. Nymphs typically personified elements of nature, like bodies of water, mountains, forests, the weather, or specific plants.

This carving derives from a passage in The Iliad that describes the nereid Thetis, mother of the hero Achilles, and other nereids carrying newly forged armour to her son.
This carving derives from a passage in The Iliad that describes the nereid Thetis, mother of the hero Achilles, and other nereids carrying newly forged armour to her son.
The Metropolitan Museum of Art, The Bothmer Purchase Fund, 1993, Object Number: 1993.11.2

The nymph Daphne

One of the most quintessential nymphs was Daphne (or Laurel, in Latin). According to the Roman poet Ovid in his poem the Metamorphoses, Daphne was a stunningly beautiful nymph who lived in the forest.

Daphne had chosen to follow in the footsteps of Artemis (Diana), the goddess of the hunt, by being a huntress and abstaining from sex and marriage. But her beauty would be her downfall.

One day the god Apollo saw Daphne and immediately tried to pursue her. Daphne did not feel similarly and fled through the forest. Apollo chased and nearly caught her.

But Daphne’s father Peneus, a river god, saved his daughter by transforming her into the laurel tree.

Like many nymphs, Daphne’s myth was an origin story for her namesake tree and its significance to the god Apollo.

But her story also followed one of the most common tropes in nymph myths – the trope a nymph transformed into her namesake after running away from a male deity.

Different nymphs for trees, water, mountains, stars

There were even special names for different types of nymph.

Daphne was a dryad, or tree nymph. Oreads (mountain nymphs) are referenced in Homer’s Iliad. There were three different types of water nymph: the saltwater oceanids and nereids, and the freshwater naiads.

Nymphs lived in the wilderness. These untamed places could be dangerous but they also held precious natural resources that nymphs personified, such as special trees and springs.

Spring nymphs personified one of the most precious resources of all: freshwater.

It was hard to find freshwater in the ancient world, especially in places without human infrastructure. Cities were often built around springs.

The nymph Arethusa was the personification of the spring Arethusa in Sicily. Today, you can visit the Fountain of Arethusa in modern day Syracuse.

No matter where you looked in the ancient landscape, there were nymphs – even in the sky.

The Pleiades and Hyades were two sets of daughters of the god Atlas who eventually were transformed into stars.

Their myths gave an origin for two sets of constellations that were used for navigation and divination.

The Pleiades and Hyades constellations were visible to the naked eye, and can still be seen today.

This painting depicts the god Bacchus (the Roman equivalent of the wine god Dionysus) lounging with some nymphs in a landscape.
This painting depicts the god Bacchus (the Roman equivalent of the wine god Dionysus) lounging with some nymphs in a landscape.
Abraham van Cuylenborch/The Metropolitan Museum of Art/Object Number: 25.110.37

The divine presence in nature

Although myths may feel like a fictional story told to kids, nymph myths show that ancient myth is inseparable from the ancient landscape and ancient people.

The natural world was imbued with a divine presence from the gods who physically made it – Gaia (Earth) was literally the soil underfoot. Nymphs were a part of this divine presence.

This divine presence brought with it a very special boon: the gift of inspiration.

Some writers (such as Plato) referred to this sort of natural inspiration as being “seized by the nymphs” (νυμφόληπτος or nympholeptus).

Being present in nature and present in places with nymphs could bring about divine inspiration for philosophers, poets and artists alike.

So, if you ever do find yourself alone in a Grecian wood, you may find yourself inspired and in good company – as long as you remain respectful.

The Conversation

Kitty Smith is a member of the Australian Society for Classical Studies and of Australasian Women in Ancient World Studies.

ref. Greek and Roman nymphs weren’t just sexy nature spirits. They had other important jobs too – https://theconversation.com/greek-and-roman-nymphs-werent-just-sexy-nature-spirits-they-had-other-important-jobs-too-258287

XFG could become the next dominant COVID variant. Here’s what to know about ‘Stratus’

Source: The Conversation – Global Perspectives – By Paul Griffin, Professor, Infectious Diseases and Microbiology, The University of Queensland

visualspace/Getty Images

Given the number of times this has happened already, it should come as little surprise that we’re now faced with yet another new subvariant of SARS-CoV-2, the virus responsible for COVID.

This new subvariant is known as XFG (nicknamed “Stratus”) and the World Health Organization (WHO) designated it a “variant under monitoring” in late June. XFG is a subvariant of Omicron, of which there are now more than 1,000.

A “variant under monitoring” signifies a variant or subvariant which needs prioritised attention and monitoring due to characteristics that may pose an additional threat compared to other circulating variants.

XFG was one of seven variants under monitoring as of June 25. The most recent addition before XFG was NB.1.8.1 (nicknamed “Nimbus”), which the WHO declared a variant under monitoring on May 23.

Both nimbus and stratus are types of clouds.

Nimbus is currently the dominant subvariant worldwide – but Stratus is edging closer. So what do you need to know about Stratus, or XFG?

A recombinant variant

XFG is a recombinant of LF.7 and LP.8.1.2 which means these two subvariants have shared genetic material to come up with the new subvariant. Recombinants are designated with an X at the start of their name.

While recombination and other spontaneous changes happen often with SARS-CoV-2, it becomes a problem when it creates a subvariant that is changed in such a way that its properties cause more problems for us.

Most commonly this means the virus looks different enough that protection from past infection (and vaccination) doesn’t work so well, called immune evasion. This basically means the population becomes more susceptible and can lead to an increase in cases, and even a whole new wave of COVID infections across the world.

XFG has four key mutations in the spike protein, a protein on the surface of SARS-CoV-2 which allows it to attach to our cells. Some are believed to enhance evasion by certain antibodies.

Early laboratory studies have suggested a nearly two-fold reduction in how well antibodies block the virus compared to LP.8.1.1.

Where is XFG spreading?

The earliest XFG sample was collected on January 27.

As of June 22, there were 1,648 XFG sequences submitted to GISAID from 38 countries (GISAID is the global database used to track the prevalence of different variants around the world). This represents 22.7% of the globally available sequences at the time.

This was a significant rise from 7.4% four weeks prior and only just below the proportion of NB.1.8.1 at 24.9%. Given the now declining proportion of viral sequences of NB.1.8.1 overall, and the rapid rise of XFG, it would seem reasonable to expect XFG to become dominant very soon.

According to Australian data expert Mike Honey, the countries showing the highest rates of detection of XFG as of mid-June include India at more than 50%, followed by Spain at 42%, and the United Kingdom and United States, where the subvariant makes up more than 30% of cases.

In Australia as of June 29, NB.1.8.1 was the dominant subvariant, accounting for 48.6% of sequences. In the most recent report from Australia’s national genomic surveillance platform, there were 24 XFG sequences with 12 collected in the last 28 days meaning it currently comprises approximately 5% of sequences.

The big questions

When we talk about a new subvariant, people often ask questions including if it’s more severe or causes new or different symptoms compared to previous variants. But we’re still learning about XFG and we can’t answer these questions with certainty yet.

Some sources have reported XFG may be more likely to course “hoarseness” or a scratchy or raspy voice. But we need more information to know if this association is truly significant.

Notably, there’s no evidence to suggest XFG causes more severe illness compared to other variants in circulation or that it is necessarily any more transmissible.

Will vaccines still work against XFG?

Relatively frequent changes to the virus means we have continued to update the COVID vaccines. The most recent update, which targets the JN.1 subvariant, became available in Australia from late 2024. XFG is a descendant of the JN.1 subvariant.

Fortunately, based on the evidence available so far, currently approved COVID vaccines are expected to remain effective against XFG, particularly against symptomatic and severe disease.

Because of SARS-CoV-2’s continued evolution, the effect of this on our immune response, as well as the fact protection from COVID vaccines declines over time, COVID vaccines are offered regularly, and recommended for those at the highest risk.

One of the major challenges we face at present in Australia is low COVID vaccine uptake. While rates have increased somewhat recently, they remain relatively low, with only 32.3% of people aged 75 years and over having received a vaccine in the past six months. Vaccination rates in younger age groups are significantly lower.

Although the situation with XFG must continue to be monitored, at present the WHO has assessed the global risk posed by this subvariant as low. The advice for combating COVID remains unchanged, including vaccination as recommended and the early administration of antivirals for those who are eligible.

Measures to reduce the risk of transmission, particularly wearing masks in crowded indoor settings and focusing on air quality and ventilation, are worth remembering to protect against COVID and other viral infections.

The Conversation

Paul Griffin has been the principal investigator for clinical trials of 8 COVID-19 vaccines. He has previously participated in medical advisory boards for COVID-19 vaccines. Paul Griffin is a director and medical advisory board member of the immunisation coalition.

ref. XFG could become the next dominant COVID variant. Here’s what to know about ‘Stratus’ – https://theconversation.com/xfg-could-become-the-next-dominant-covid-variant-heres-what-to-know-about-stratus-260499