Navigating mental illness in the workplace can be fraught, but employees are entitled to accommodations

Source: The Conversation – USA (3) – By Julie Wolfe, Assistant Professor of Psychiatry, University of Colorado Anschutz Medical Campus

Coping with mental illness can make starting and completing simple tasks at work more difficult. Fiordaliso/Moment via Getty Images

Mental health challenges can affect anyone, regardless of background or circumstance, and they are becoming more common across the United States.

In 2022, a national survey found that about 60 million American adults – approximately 23% of the U.S. adult population – were living with a mental illness, defined as a diagnosable mental, emotional or behavioral disorder.

This translates to a nearly 37% increase over the past decade.

These conditions can have a profound and lasting effect on patients’ lives, including their ability to engage meaningfully and sustainably in the workforce.

Globally, depression and anxiety are estimated to lead to 12 billion lost working days annually, costing an estimated US$1 trillion per year in lost productivity worldwide and $47 billion in the United States.

I am a medical director and practicing psychiatrist. I work with graduate students, residents, faculty and staff on a health science campus, supporting their mental health – including when it intersects with challenges in the workplace.

I often meet with patients who feel unsure about how to approach conversations with their schools, programs or employers regarding their mental health, especially when it involves taking time off for care. This uncertainty can lead to delays in treatment, even when it’s truly needed.

Mental health by the numbers

Anxiety and depression are the most common mental health conditions in the U.S.. Nineteen percent of American adults suffer from an anxiety disorder, and more than 15% have depression.

Meanwhile, about 11% of Americans experience other conditions such as post-traumatic stress disorder, commonly known as PTSD, bipolar disorder, borderline personality disorder or obsessive-compulsive disorder.

Rates of anxiety and depression increased worldwide during the COVID-19 pandemic. But one positive consequence of the pandemic is that talking about mental health has become more normalized and less stigmatized, including in the workplace.

Struggling at work

For those with mental illness, the traditional expectation of maintaining a strict separation between personal and professional life is not only unrealistic, it may even be detrimental. The effect of mental illness on a person’s work varies depending on the type, severity and duration of their symptoms.

For instance, severe depression can affect basic self-care, making it difficult to complete tasks such as bathing, eating or even getting out of bed. Severe anxiety can also be profoundly debilitating and limit a person’s ability to leave the house due to intense fear or panic. The symptoms of such severe mental illness may make it difficult even to show up to work.

On the other hand, someone struggling with mild depression or anxiety may have a hard time initiating or completing tasks that they would typically manage with ease and find it difficult to interact with colleagues. Both depression and anxiety may affect sleep, which can contribute to cognitive lapses and increased fatigue during the work day.

Someone with PTSD may find that certain environments remind them of traumatic experiences, making it difficult to fully engage in their work. And a person experiencing a manic episode related to bipolar disorder might need to take time away from work entirely to focus on their stabilization and recovery.

Knowing when to ask for help

Identifying a trusted colleague, supervisor or human resources representative can be an important first step in managing your mental health at work. While selecting the right person to confide in may be challenging, especially given the vulnerability associated with disclosing mental health concerns, doing so can open pathways to appropriate resources and tailored support services.

For instance, it might encourage an employer to consider offering access to free or low-cost mental health care if it’s not already available, or to provide flexible scheduling that makes it easier for employees to get mental health treatment.

It’s also important to be aware of changes in your mental health. The earlier you can recognize signs of decline, the sooner you can get the support that you need, which might prevent symptoms from worsening.

On the other hand, sharing sensitive information with someone who is not equipped to respond appropriately could lead to unintended consequences, such as workplace gossip, unmet expectations and increased frustration due to perceived lack of support. However, even if your supervisor or manager is not understanding, that doesn’t change the fact that you have rights in the workplace.

In 2022, U.S. Surgeon General Vivek Murthy warned that American workplaces needed to change to better support employees’ well-being.

Consider exploring accommodations

The Americans with Disabilities Act provides critical protections for individuals with disabilities in the workplace. Under the act, it is unlawful for employers to discriminate against qualified individuals based on a disability.

The law also requires employers to provide reasonable accommodations so that people who qualify are able to participate fully in the workplace provided that they do not impose undue burden on the place of employment.

There are many reasonable accommodations for workers with mental illness. These can include protected time to attend mental health appointments and flexibility in work schedules and workplace.

For instance, if your job allows for it, working from home can be helpful. If your job requires being on site, a private work space is another reasonable accommodation. Someone with anxiety might find that working in a quiet, private space helps reduce distractions that trigger their symptoms, making it easier for them to stay focused and get things done.

Other possible accommodations include providing sick leave or flexible vacation time to use for mental health days or appointments, or allowing an employee to take breaks according to their individual needs rather than a fixed schedule. Employers can also provide support by offering equipment or technology such as white noise machines or dictation software.

The role of the workplace

An organization’s commitment to supporting employee mental health can play a large role in shaping how well employees perform at work – and, ultimately, the organization’s success.

Relying on individual employees to manage their mental health is not a sustainable long-term strategy for employers and may lead to significant workplace disruptions, such as more missed work days and lower productivity.

Studies show that when employers lead targeted initiatives promoting mental health, overall workplace functioning and resilience improve. These initiatives might include educating employees on mental health, providing accessible care, helping employees have better work-life balance and designing supportive workplace policies for those who are struggling. These steps help reduce stigma and signal to employees that it’s safe to seek support.

The Conversation

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

ref. Navigating mental illness in the workplace can be fraught, but employees are entitled to accommodations – https://theconversation.com/navigating-mental-illness-in-the-workplace-can-be-fraught-but-employees-are-entitled-to-accommodations-259802

La qualité des médicaments anticancéreux en Afrique est préoccupante : une étude dans 4 pays sonne l’alerte

Source: The Conversation – in French – By Marya Lieberman, Nancy Dee Professor, Department of Chemistry and Biochemistry, University of Notre Dame

Plus de 800 000 personnes sur le continent sont diagnostiquées chaque année avec un cancer. Le nombre de personnes recevant un traitement contre cette maladie a considérablement augmenté au cours de la dernière décennie dans de nombreux pays africains. Par exemple, il y a dix ans, en Éthiopie et au Kenya, seuls quelques milliers de patients par an pouvaient bénéficier de soins contre le cancer dans quelques hôpitaux. Aujourd’hui, plus de 75 000 personnes reçoivent un traitement contre le cancer chaque année dans ces deux pays.

Mais les agences de réglementation des médicaments de nombreux pays n’ont pas la capacité de mesurer la qualité des médicaments anticancéreux. Cela pose deux problèmes majeurs. Premièrement, le coût élevé des médicaments incite à opter pour des médicaments non homologués. Deuxièmement, certains de ces médicaments sont très toxiques.

La forte demande, combinée à un manque de contrôle réglementaire, crée un terrain propice à la circulation de médicaments de qualité inférieure ou contrefaits. Des rapports inquiétants font état de ce type de produits causant des dommages aux patients dans plusieurs pays, notamment au Brésil, aux États-Unis et au Kenya. Mais aucune étude systématique sur la qualité des médicaments anticancéreux dans les pays à revenu faible et intermédiaire n’a été réalisée. Par conséquent, on sait peu de choses sur la qualité des médicaments utilisés pour traiter le cancer en Afrique.

Je suis chercheur en cancérologie aux États-Unis et je développe des technologies permettant de détecter les médicaments de qualité inférieure ou contrefaits dans les milieux défavorisés. En 2017, j’ai collaboré avec Ayenew Ashenef de l’université d’Addis-Abeba pour tester un dispositif conçu pour évaluer la qualité des médicaments anticancéreux. Nous avons été consternés de constater que la plupart des médicaments utilisés dans un hôpital en Éthiopie étaient de qualité inférieure. Nous avons alors élargi l’étude.

Ce que révèle notre étude dans 4 pays africains

Notre récente étude a examiné la qualité de sept médicaments anticancéreux dans quatre pays africains. Il s’agissait du cisplatine, de l’oxaliplatine, du méthotrexate, de la doxorubicine, du cyclophosphamide, de l’ifosfamide et de la leucovorine. La plupart de ces médicaments sont administrés aux patients par voie intraveineuse. Ils sont utilisés pour traiter le cancer du sein, le cancer du col de l’utérus, les cancers du cerveau et du cou, les cancers du système digestif et de nombreux autres types de cancers. Certains sont également utilisés pour traiter des maladies auto-immunes telles que le lupus.

Les membres de notre équipe de recherche ont collecté 251 produits anticancéreux au Cameroun, en Éthiopie, au Kenya et au Malawi en 2023 et 2024. Les échantillons provenaient de 12 hôpitaux et de 25 pharmacies publiques ou privées. Certains ont été achetés discrètement, d’autres de façon ouverte.

Nous avons analysé la teneur en principe actif de chaque médicament.

Nous avons alors découvert des médicaments anticancéreux de qualité inférieure ou falsifiés dans les quatre pays. Nous avons découvert que 32 (17 %) des 191 lots uniques de sept produits anticancéreux ne contenaient pas la quantité correcte de principe actif pharmaceutique. Des produits de qualité inférieure ou contrefaits étaient présents dans les principaux hôpitaux spécialisés sur le cancer et sur le marché privé dans ces quatre pays.

D’après nos conclusions, il est clair que les praticiens en oncologie et les systèmes de santé en Afrique subsaharienne doivent être conscients de la présence possible de produits anticancéreux de qualité inférieure dans leurs stocks. Nous recommandons donc de renforcer les systèmes de réglementation afin d’assurer une meilleure surveillance.

Comment nous avons testé la qualité des médicaments

Pour mesurer la quantité de principe actif présent dans un flacon ou un comprimé, nous avons utilisé la chromatographie liquide haute performance, ou CLHP. Cette technique permet de séparer et de quantifier les molécules et constitue la méthode de référence pour tester la quantité de principes actifs dans les comprimés, les gélules et les flacons de médicaments.

Avant de préparer les médicaments pour l’analyse, nous avons inspecté les médicaments et leurs emballages. Nous avons ensuite utilisé la HPLC pour mesurer la quantité d’ingrédient pharmaceutique actif présent afin de vérifier si elle correspondait à celle indiquée sur l’étiquette. Chaque produit pharmaceutique a une plage de dosage cible qui est définie dans sa monographie pharmacopée. Celle-ci correspond généralement à 90 %-110 % de la quantité d’ingrédient pharmaceutique actif indiquée sur l’emballage. Ainsi, par exemple, si un flacon indique contenir 100 milligrammes de doxorubicine, il est toujours considéré comme étant de « bonne qualité » s’il contient 93 milligrammes de doxorubicine, mais pas s’il en contient 38 mg ou 127 mg.

Sur les 191 numéros de lot uniques, 32 ont échoué au test, soit environ un sur six.

Plusieurs fabricants ont vu leurs produits échouer au test à des taux plus élevés. Il n’y avait pas de différences significatives dans le taux d’échec des produits collectés dans différents pays, dans les hôpitaux par rapport aux pharmacies, ou même pour les produits testés après leur date d’expiration par rapport à ceux testés avant leur date d’expiration.

La plupart des pays africains utilisent l’inspection visuelle pour identifier les médicaments anticancéreux suspects. De tels produits peuvent échouer à l’inspection visuelle s’ils ont une couleur incorrecte après reconstitution, s’ils contiennent des particules visibles ou s’il y a des irrégularités liées à l’emballage. Or, de manière surprenante, notre étude a montré que les produits ayant échoué au test de chromatographie liquide haute performance ne pouvaient être distingués visuellement des produits qui ont réussi le test. Seuls 3 des 32 produits ayant échoué présentaient des irrégularités visibles.

Les perspectives

La situation que nous avons mise au jour est probablement similaire dans d’autres pays à faible revenu. Nous espérons que la communauté scientifique mondiale accordera davantage d’attention à la qualité de cette catégorie de médicaments en intensifiant la recherche. C’est ce qui a été fait pour les antipaludiques dans les années 2000, ce qui a permis d’améliorer considérablement la qualité de ces médicaments.

Les informations sur la qualité des médicaments anticancéreux sont essentielles, car la chimiothérapie contre le cancer repose sur un équilibre très délicat : tuer les cellules cancéreuses sans mettre la vie du patient en danger. Si la dose administrée au patient est trop importante, celui-ci peut subir les effets secondaires toxiques du médicament. Si la dose est trop faible, le cancer peut continuer à se développer ou à se propager à d’autres parties du corps, et le patient peut alors perdre sa précieuse chance de guérison.

Nous avons partagé nos conclusions avec les autorités de réglementation des quatre pays où les échantillons ont été prélevés et nous nous efforçons de renforcer les capacités de surveillance post-commercialisation de ces médicaments essentiels.

The Conversation

Marya Lieberman reçoit un financement des National Institutes of Health (NIH) des États-Unis. Les recherches présentées dans cette publication ont été soutenues par le National Cancer Institute des NIH sous le numéro de subvention U01CA269195. Le contenu relève de la seule responsabilité de l’auteur et ne reflète pas nécessairement les opinions officielles des NIH.

ref. La qualité des médicaments anticancéreux en Afrique est préoccupante : une étude dans 4 pays sonne l’alerte – https://theconversation.com/la-qualite-des-medicaments-anticancereux-en-afrique-est-preoccupante-une-etude-dans-4-pays-sonne-lalerte-268235

La selección: ¿cómo arreglamos el sistema alimentario?

Source: The Conversation – (in Spanish) – By Lucía Caballero, Coordinadora internacional / Editora de Medio Ambiente y Energía, The Conversation

Perpis/Shutterstock

Somos más de ocho millones de humanos en la Tierra. Más de ocho millones de personas que necesitan comer todos los días. Afortunadamente, hemos desarrollado diferentes avances científicos y técnicos que nos han permitido producir y distribuir alimentos por gran parte del mundo, pero el coste ambiental ha sido enorme: la agricultura y la ganadería generan abundantes emisiones de gases de efecto invernadero, consumen mucha agua y provocan pérdida de biodiversidad, contaminación y deforestación.

La huella que deja este modelo en el planeta es insostenible, pero hay un amplio margen para el cambio.

Menos desperdicio y fertilizantes más eficientes

Una forma de mejora consiste en reducir el desperdicio. Ahora mismo, tiramos a la basura un tercio de los alimentos producidos en todo el mundo, tanto por parte de la industria como en los hogares. Y con ellos, desperdiciamos los recursos empleados para generarlos. Para frenar esta tendencia es necesario actuar en todos los niveles de la cadena alimentaria, desde el usuario final hasta los agricultores y distribuidores.

Otras estrategias se centran en modificar las prácticas agrícolas, por ejemplo, con una fertilización más eficiente (el nitrógeno no utilizado por las plantas contamina el suelo, la atmósfera y el agua), reduciendo la necesidad de riego y cuidando la salud del suelo y la biodiversidad.

También en el caso de la ganadería, es posible reducir el consumo de agua y priorizar las prácticas de pastoreo frente al modelo industrial.

Mayor consumo de algas e insectos

Incluir más productos vegetales y marinos, y disminuir el consumo de aquellos de origen animal en nuestra dieta, contribuye a limitar las emisiones de gases de efecto invernadero del sistema alimentario.

Pero además, existen otras alternativas más allá de los alimentos tradicionales. Por ejemplo, las algas y las microalgas constituyen fuentes interesantes de nutrientes cuya obtención tiene un bajo impacto ambiental (no requieren tierra cultivable, fertilizantes ni agua dulce) y puede, de hecho, contribuir a mitigar el cambio climático y la acidificación de los océanos.

Los insectos suponen otra opción innovadora con una baja huella ecológica. Su cría requiere menos recursos, emite menos gases de efecto invernadero y genera menos desechos que las fuentes tradicionales de proteína animal. La industria en torno a este alimento está creciendo considerablemente, y en Europa ya se han aprobado cuatro especies para el consumo humano.

Solo cambiando el actual esquema de producción y consumo de alimentos podremos alcanzar los objetivos de reducción de emisiones y de conservación de la biodiversidad, y garantizar la seguridad alimentaria de una población en constante crecimiento.

The Conversation

ref. La selección: ¿cómo arreglamos el sistema alimentario? – https://theconversation.com/la-seleccion-como-arreglamos-el-sistema-alimentario-267799

Who controls the air we breathe at home? Awaab’s law and the limits of individual actions

Source: The Conversation – UK – By Amber Yeoman, Postdoctoral Research Associate in Atmospheric Emissions, University of York

richardjohnson/Shutterstock

Awaab Ishak, a two-year-old child, died in 2020 after prolonged exposure to mould in his social housing association home. The inquest into his death found that, despite repeated reports by his parents about the property’s uninhabitable conditions, their concerns were dismissed and the housing association failed to take sufficient action.

In response to his tragic death, new legislation known as Awaab’s law now requires social housing associations in the UK to urgently address “all damp and mould hazards that present a significant risk of harm to tenants”.

This is a positive step forward in tackling damp and mould in social housing rented accommodation, which significantly contributes to poor indoor air quality. It also recognises that building occupants cannot always take the necessary actions to improve air quality themselves.




Read more:
Awaab’s law is a start but England needs whole new approach to ensure healthy homes for all


Efforts to maintain good indoor air quality often focus on changing individual behaviour, such as opening windows, using extractor fans and running dehumidifiers or air cleaners. While these measures can help, they are not always affordable or effective on their own. Even when occupants know there is a serious indoor air quality issue, which can have many sources such as mould, heating systems and building materials, they may lack the capability to do anything about it. This was the case for Awaab and his family, as the social housing association refused to act.

Our 2025 research paper explores how people’s ability – or capability – to make changes that improve air quality varies depending on housing tenure (for example, private rental, social housing, owner-occupied). In this context, capability refers to the level of control someone has to alter conditions that affect indoor air, such as fixing damp, improving ventilation, or replacing pollutant-emitting materials.

The figure below, also from our paper, shows the link between housing tenure type and capability. The blue bar represents the proportion of the English population living in each tenure type. The red bar below it shows how much control people have over sources of poor indoor air quality, with the most control on the right and the least on the left. Each box within the red bar represents a different activity or source that impacts air quality indoors.

Only one-third of these activities are accessible to those who do not own their home. Even property owners are often unable to influence major factors, such as the materials their house is built from or the outdoor air quality in their area. The activities that offer the least control, such as upgrading insulation, replacing heating systems, or renovating walls and floors to remove pollutant-emitting materials, usually require significant resources such as money, time and space. This highlights how unreasonable it is to blame household air quality issues on lifestyle choices when so many factors are outside an occupant’s control.

Awaab’s law acknowledges that renters face barriers to preventing and fixing damp and mould. It requires social housing associations to respond promptly to all reports of damp and mould, and it explicitly states that it is unacceptable to assume that these problems are caused by a tenant’s lifestyle. Housing associations are also prohibited from using lifestyle as an excuse for inaction.

In the future, Awaab’s law will expand to cover other hazards that tenants cannot easily control, such as extreme temperatures, falls, explosions, fires and electrical risks. However, it does not yet address other causes of poor indoor air quality, including building and decorating materials, heating systems and cooking practices. These sources can emit pollutants such as volatile organic compounds (VOCs) – gases released from paints, varnishes, cleaning products and furniture – and particulate matter – tiny solid or liquid particles produced by activities such as cooking, heating and burning candles. Both can enter the lungs and bloodstream, contributing to breathing problems, allergies, heart disease and, over time, even cancer. These pollutants, then, can be just as harmful to health as damp and mould.

But, unlike mould, which can usually be identified by sight or smell, these pollutants often go unnoticed. A lack of understanding about these pollutants and their sources limits what occupants can do to improve air quality in their homes. So it is essential that people have access to clear information about potential pollutant sources, such as the products and furniture they buy. If this information is not readily available, the responsibility unfairly falls back on occupants once again.

Awaab’s law is an important recognition that tenants are not solely responsible for damp and mould in their homes. It will help protect some of the most vulnerable people living in uninhabitable conditions, yet it stops short of addressing other contributors to poor indoor air quality.

Understanding and tackling these wider issues would benefit everyone, regardless of housing tenure. These broader structural factors include the age and design of buildings, the quality of construction materials, housing regulations, and the social inequalities that limit tenants’ ability to make improvements. Until these underlying conditions are addressed, indoor air quality in the UK will not truly improve.

The Conversation

Amber Yeoman receives funding from UKRI and Defra.

Douglas Booker is the Co-Founder and CEO of NAQTS Ltd, a business that develops tools and technologies to provide holistic indoor air quality information. He receives funding from UKRI, NIHR, and EPSRC. He is affiliated with the Clean Air Champions team as part of SPF Clean Air Programme.

Faisal Farooq 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. Who controls the air we breathe at home? Awaab’s law and the limits of individual actions – https://theconversation.com/who-controls-the-air-we-breathe-at-home-awaabs-law-and-the-limits-of-individual-actions-268060

How new renters’ rights could drive landlords out of the market

Source: The Conversation – UK – By Nikhil Datta, Assistant Professor, Economics, University of Warwick

Rawpixel.com/Shutterstock

The UK’s rental market has changed dramatically over recent decades, with the proportion of renters doubling to 30% since 2000. Over the same period, housing costs have increased far faster than wages.

Historically, the rental sector has faced less regulation in the UK than in many other European countries. But now new legislation aims to improve the security of tenancies in England and strengthen tenant protections against environmental hazards.

Many elements of the renters’ rights bill are likely to improve the lives of renters without harming landlords. But some of the improvements for tenants will make being a landlord more difficult or even, for some, undesirable. So far, we feel that the proposed measures fall into three groups – the good, the not-so-good, and the complicated.

The good

A government report from 2023 estimated that 3.6% of private rented properties had serious levels of damp and mould. One section of the bill will extend “Awaab’s law” (named after two-year-old Awaab Ishak, who died as a result of living in a mould-infested home) to the private rental sector, offering protection to tenants in problem properties.

Also, a new private rental sector landlord ombudsman will be able to help tenants resolve disputes without slow and costly legal proceedings. The creation of a private rented sector database will improve transparency for tenant and compliance with pre-existing laws by landlords.

The not-so-good

The bill seeks to end the practice of “rental bidding”, where landlords can effectively maximise the rent they receive. Landlords and letting agents will not be allowed to accept more than the initial rent advertised.

In practice, many landlords may simply raise their initial asking rents so the new rule has little actual effect on the prices tenants face. Additionally, evidence from other markets, such as eBay, suggests that auction-style price setting has in many cases resulted in lower prices relative to simply posting a price.

As such, it is not clear this policy will have the intended effect. But the bill does also seek to regulate rent increases for incumbent tenants.

One of the most important parts of the bill is the abolition of “section 21 evictions” (so-called “no fault” evictions). Abolishing section 21 would leave landlords relying on what’s known as a “section 8 notice”, a written document used when a tenant has broken the rules of their rental agreement.

And while a section 8 does allow landlords to recover costs, it also requires a full court hearing. Yet evidence suggests that landlords are often willing to forego the prospect of reclaiming losses in order to get their property back quickly.

A key reason for this is the stretched court system and the length of time repossession can take (often as long as a year). The bill missed an opportunity to tackle costly court delays by creating a specialist housing court – something that could have been easily funded by a tiny levy on the UK’s annual £55 billion in rental income.

The complicated

Overall, the reforms are likely to increase the cost (and decrease the income) of being a landlord. This may push some landlords to leave the sector and change the composition of landlords active in the market. There is strong evidence of net market exit in the case of rent controls from other countries, including the US and Spain.

UK landlords have seen negative impacts on profits from several recent policies, including the phasing out of mortgage interest tax deductibility, stamp duty on second properties, and the 2019 Tenant Fees Act which banned letting fees in the private sector. Our own research on this found that landlords ended up paying about 25% of the fee previously covered by tenants.

exterior shot of a block of flats with banners reading 'rent me' draped from the balconies.
Recent policy changes have come at a cost to landlords.
Zeynep Demir Aslim/Shutterstock

Landlords quitting the sector is not necessarily a major concern, but how it affects the functioning of the market could be.

When landlords sell their properties, a key question is who buys them? Basic economics suggests that landlords exiting the sector reduces prices in the property market, making it possible for some renters to buy.

But the realities of the UK housing market mean things are not so simple. The large deposits required and limited access to mortgages and credit will still prevent many renters from being able to buy a home.

In any case, it would apply only to a small share of renters. If the reform increases the cost of becoming a landlord, it is likely that part of that increase will be passed over to tenants.

The UK letting market is dominated by “mom-and-pop” landlords (those with just a small number of properties), while other countries such as the US have seen a rise in institutional investors. It is possible that the bill could contribute to a similar rise in the UK, which could lead to higher rents as those big players are more able to exert market power.

The immediate effects of the bill may be modest. But a bigger concern lies ahead. Will lower house prices reduce construction activity and ultimately depress housing supply? This is certainly possible, but the government has other levers it can – and should – pull with regard to modernising the planning system and making construction cheaper. These measures could boost supply and improve affordability for both renters and buyers alike.

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. How new renters’ rights could drive landlords out of the market – https://theconversation.com/how-new-renters-rights-could-drive-landlords-out-of-the-market-267671

How England’s new Reform councillors compare in their views to other parties

Source: The Conversation – UK – By David Jeffery, Senior Lecturer in British Politics, University of Liverpool

Reform UK has positioned itself as the voice of discontent in British politics – a home for voters who feel both Labour and the Conservatives have lost touch with ordinary people.

Following elections in May, Reform is now a significant presence in local government with 921 councillors across England. The party pitched itself as an alternative to the traditional mainstream parties – we wanted to see whether this was actually the case on the local level.

We found Reform councillors to be less in favour of building in their local area and more interested in seeing government money spent on crime and policing than their colleagues from other parties.

This research is based on survey responses from councillors across the four largest parties — the Green party, Labour, Liberal Democrats and Conservatives — which we conducted as part of our report What Do British Politicians Think? A study into the views of MPs, councillors, and the public. The survey was carried out between January and February 2025 and we then conducted a follow-up survey of Reform UK councillors after the May local elections. This ran between August and September.

We rated the councillors’ responses to some questions on a 0-1 scale. When asked about immigration, for example, a rating of 0 suggests the councillor thought immigration too low, and 1 that they thought it too high. On this issue, Reform UK scored 1 – every councillor surveyed thought immigration had been too high.

Conservative councillors were not far off, with a score of 0.97. Labour and Liberal Democrats were roughly equal at 0.6 and 0.59 respectively, leaning towards too high, whereas Green councillors were slightly more likely to say immigration had been too low, with a placement of 0.44. This reflects one of the key dividing lines in British politics today, but also suggests that the more pro-immigration messages pushed by Labour and the Liberal Democrats nationally may not be overly popular among their councillor bases.

A chart showing how councillors from different parties responded to questions on key issues.
Where councillors from different parties sit on various issues.
D Jeffery, CC BY-ND

Labour councillors (perhaps reflecting the stated preferences of the party in government) were more in favour of ramping up building works than other parties. Tory and Reform councillors were more likely to oppose investment in large infrastructure projects in the UK if that also meant government borrowing had to increase significantly in order to fund them. Reform councillors were the most strongly opposed to a large increase in new housing in their area. The Conservatives and Greens were also more likely to be opposed while Lib Dems were somewhere in the middle. Labour councillors were, again, most in favour.

NHS, tax and spend, crime and policing

We found that 96% of Reform councillors think concerns over climate change have been exaggerated, compared to no Green councillors believing this (and just 3% of Liberal Democrat and Labour councillors). On whether the courts are too harsh, Reform councillors were most likely to say not harsh enough, followed by the Conservatives. The Greens are the least likely to say they are too harsh, whereas Labour and the Liberal Democrats are more toward the centre. On the issue of NHS provision, only the Conservative councillors leant towards privatisation. Reform followed behind but privatisation was still a minority view. The other parties all skewed towards maintaining public provision.

On tax and spend, the parties cluster more clearly – the Greens, Labour and Liberal Democrats want more tax and spending whereas the Conservatives and Reform both want a smaller state.

Asked in which areas the government should spend more money, the Conservatives and Reform councillors both selected the same top three areas (although not in the same order) – crime and policing, defence and education. Labour and the Liberal Democrats also chose the same three areas (again, not in the same order) – the NHS, local government and education. Green councillors chose the environment as the area most deserving of extra spending, followed by the NHS and with local government and education neck-and-neck.

Our polling suggests that a clear divide exists in local government along overlapping economic and cultural lines. Reform councillors typically take the most rightwing positions (except on the NHS), followed by the Conservatives, including on the tax and spend question. There is often little difference between Labour and the Liberal Democrats on the centre left/left, and then the Greens take the most leftwing position.

The one area where this does not hold up, however, is building. Here, the Greens become somewhat aligned with Reform and the Conservatives in their more sceptical views, whereas Labour and the Lib Dems are more in favour – reflecting tensions between environmental priorities, local preferences and economic growth.

The Conversation

The research presented in this report was made possible by funding from a British Academy/Leverhulme Small Research Grant (SRG24240513).

ref. How England’s new Reform councillors compare in their views to other parties – https://theconversation.com/how-englands-new-reform-councillors-compare-in-their-views-to-other-parties-268011

Cambio de hora: dos de invierno, por favor

Source: The Conversation – (in Spanish) – By Daniel Gabaldón Estevan, Profesor Titular de Universidad, Sociología, Universitat de València

New Africa/Shutterstock

Desde que el pasado lunes el presidente del Gobierno de España, Pedro Sánchez, expresara su determinación de retomar el abandono del cambio horario en la UE se ha avivado el debate sobre si es mejor quedarse con el llamado horario de invierno o con el de verano. Los cronobiólogos denuncian que al ser preguntados, muchos ciudadanos eligen el segundo porque lo asocian con días más largos y más luminosos. Pero lo cierto es que elijamos el que elijamos, los días de invierno serán igual de cortos que siempre.

Cómo erradicar para siempre el cambio de hora

Necesariamente, el debate ha de ser otro, y es que en el caso de España deberíamos acumular dos cambios sucesivos de invierno (y ninguno de verano) hasta quedarnos en la zona horaria que nos corresponde. Y entonces podremos erradicar para siempre el cambio de hora.

Y esto es así porque España es el país europeo donde la discordancia entre la hora oficial y la hora solar es más extrema. Esto lo expresaron muy bien Till Roenneberg, Eva C. Winnebeck y Elizabeth B Klerman con el gráfico que reproducimos abajo, y que pueden comprobar los lectores descargándose en el móvil cualquier aplicación que les indique la hora solar de la ubicación en la que se encuentren.

Mapa de Europa dónde las zonas horarias solares reales se dibujan con fondos codificados por colores, y las zonas horarias sociales se muestran con los mismos colores (más intensos) al frente. Incluso con el horario estándar, las zonas occidentales de las zonas horarias sociales están muy alejadas de los límites orientales de las zonas horarias solares (A); esta discrepancia aumenta en 1 hora con el horario de verano (B). Una solución al problema (C): las fronteras políticas de Europa son ideales para la correcta separación cronobiológica de las zonas horarias, de modo que en ninguna zona de Europa el reloj social tenga una discrepancia con el reloj solar de más de 30 minutos.
© 2019 Roenneberg, Winnebeck and Klerman, CC BY

Doble adelanto

De los dos adelantos respecto del huso horario que nos corresponde en España (la franja amarilla en el mapa), uno es permanente y el otro estacional, y tienen su origen en dos momentos históricos bien reconocibles.

El adelanto permanente de una hora se estableció en 1940 al fijar de manera arbitraria que la hora oficial en la España peninsular, Baleares, Ceuta y Melilla fuese la que corresponde al huso horario de Centroeuropa (GTM+1). Así se abandonaba el huso del meridiano de Greenwich (GTM) que nos corresponde por ubicación geográfica (y adelantando, a su vez, a GTM el horario de Canarias, que hasta aquel momento se situaba correctamente en GTM-1).

El segundo adelanto –de carácter intermitente y con antecedentes durante algunos periodos del primer tercio del siglo XX– se consolidó con la llamada crisis del petróleo de 1973. Este segundo cambio trataba de reducir la factura energética (obviando las consecuencias para la salud de tal desfase horario) y es al que asociamos el cambio de hora recurrente que ahora se plantea eliminar. Pero como hemos visto, es solo la mitad del problema.

El mito de que en España se come más tarde

Una comparación de España con otro país mediterráneo como Italia –a una hora solar de diferencia, pero con el mismo horario oficial– nos muestra que realizamos las comidas principales una hora oficial más tarde pero a la misma en términos de hora solar. Esto viene a demostrar que el mito de que en España se come más tarde que en el resto de Europa se mantiene solo porque vivimos en una ficción horaria: el hambre tiene un fuerte componente circadiano.

Distribución diaria de las principales actividades para la población italiana (parte superior) y española (parte inferior) de entre 10 y 70 años de edad.
Del artículo ‘A deshora en la escuela’, Daniel Gabaldón Estevan. Publicado en la revista RASE (2021)

Así, cuando alguien en España dice que come a las 14:00 en realidad lo hace a las 13:00 hora solar (con el horario de invierno) o a las 12:00 hora solar (con el de verano), como en la inmensa mayoría de países europeos, también en el sur.

Jet lag social

Lo que sí nos diferencia de Italia es que el reloj social nos presiona para comenzar el día antes. Hay más gente en España que se ve forzada a madrugar en exceso y a no descansar lo suficiente.

En este punto, es importante señalar que lo que provoca problemas de salud, de accidentes de tráfico, de rendimiento escolar y de productividad laboral es la disrupción entre el reloj interno de las personas y el reloj social. El primero depende de la edad, factores genéticos y ambientales, y su mayor sincronizador es la potente luz solar que recibimos cada día a través de los ojos. Por su parte, el reloj social se manifiesta a través de compromisos como los horarios laborales o escolares que nos disciplinan para coordinarnos con otros miembros de nuestra sociedad y que generalmente requiere el uso de despertadores.

A la discrepancia entre ambas se le denomina jet lag social porque el efecto es parecido al que se produce cuando nos desplazamos entre zonas horarias y que requiere algunos días hasta aclimatarnos al nuevo huso horario. A diferencia de lo que ocurre en los viajes, al jet lag social no nos habituamos nunca porque, aunque nos despertemos con un despertador que muestra la hora solar de Varsovia (en invierno) o Kiev (en verano), nuestro organismo se sincroniza en realidad cada día con la hora solar del lugar donde vivimos.

Tal desajuste afecta de manera notable, pero no exclusiva, a la población escolar, ya que esta retrasa de manera natural su ciclo circadiano durante la pubertad y la adolescencia, generando un déficit de sueño crónico que afecta a su salud, su bienestar y su rendimiento.

The Conversation

Daniel Gabaldón Estevan recibe fondos de la Agencia Estatatl de Investigación y de la Generalitat Valenciana a través del proyecto PID2021-126846NA-I00/AE/10.13039/501100011033 y CIACO/2023/120 (Des)ajuste de cronotipo del alumnado
y la organización del tiempo escolar: sus efectos en la salud, el aprendizaje, el uso del tiempo y la satisfacción (Kairos).

ref. Cambio de hora: dos de invierno, por favor – https://theconversation.com/cambio-de-hora-dos-de-invierno-por-favor-268223

Pourquoi Halloween commence-t-elle beaucoup plus tôt chaque année ?

Source: The Conversation – in French – By Jay L. Zagorsky, Associate Professor Questrom School of Business, Boston University

Halloween trouve ses racines dans une fête celtique honorant les morts. 12Studio/shutterstock

Autrefois fête modeste d’automne, Halloween s’est transformée en un phénomène commercial qui s’étend sur une période de plus en plus longue. On peut difficilement blâmer les commerçants.


Halloween est une période amusante et effrayante pour les enfants et les adultes, mais pourquoi cette période semble-t-elle commencer beaucoup plus tôt chaque année ? Il y a des décennies, quand j’étais jeune, Halloween était une fête concentrée sur quelques jours, et les gens ne commençaient à se préparer qu’à la mi-octobre. Aujourd’hui, dans mon quartier près de l’endroit où j’ai grandi dans le Massachusetts, les décorations d’Halloween commencent à apparaître au milieu de l’été.

Ce qui a changé, ce n’est pas seulement le moment où nous célébrons, mais comment : Halloween est passée d’une simple tradition folklorique à un événement commercial massif. En tant que professeur d’école de commerce qui étudie l’économie des vacances depuis des années, je suis stupéfait par la façon dont le business d’Halloween s’est développé. Et comprendre l’ampleur de cette fête commerciale peut aider à expliquer pourquoi elle commence de plus en plus tôt.

Le business d’Halloween

Les racines d’Halloween sont à chercher du côté d’une fête celtique honorant les morts, plus tard adaptée par l’Église catholique comme un moment pour se souvenir des saints. Aujourd’hui, il s’agit en grande partie d’une célébration laïque — une célébration qui donne aux gens de tous horizons une chance de se déguiser, de s’engager dans la fantaisie et d’affronter leurs peurs en toute sécurité.

Ce large attrait a alimenté une croissance explosive. Depuis 2005, la National Retail Federation a interrogé les Américains sur leurs projets pour Halloween chaque mois de septembre. À l’époque, un peu plus de la moitié des Américains ont déclaré qu’ils prévoyaient de célébrer. En 2025, près des trois quarts ont dit qu’ils le feraient — un bond énorme en 20 ans.

Et les gens prévoient de débourser plus d’argent que jamais. Selon la fédération, les dépenses totales pour Halloween devraient atteindre un record de 13 milliards de dollars cette année, soit près de quatre fois plus qu’au cours des deux dernières décennies. En tenant compte de l’inflation et de la croissance démographique, j’ai constaté que l’États-unien moyen dépensera environ 38 dollars pour Halloween cette année – contre seulement 18 dollars par personne en 2005. C’est beaucoup de maïs sucré.

Les importations de bonbons montrent une tendance similaire. Septembre a longtemps été le mois clé pour le commerce des bonbons, avec des importations d’environ un cinquième plus élevées que pendant le reste de l’année. En septembre 2005, les États-Unis ont importé environ 250 millions de dollars de ces sucreries. En septembre 2024, ce chiffre avait triplé pour atteindre environ 750 millions de dollars.

Cela fait partie d’une tendance plus large d’Halloween qui devient un évènement beaucoup plus professionnalisé. Par exemple, quand j’étais enfant, il n’était pas rare que les familles distribuent des brownies, des pommes confites et d’autres friandises faites maison aux enfants. Mais en raison de problèmes de sécurité et d’allergies alimentaires, pendant des décennies, les Américains ont été avertis de s’en tenir à des bonbons produits en masse et emballés individuellement.

Le même changement s’est produit avec les costumes. Il y a des années, beaucoup de gens fabriquaient le leur. Aujourd’hui, les costumes achetés en magasin deviennent majoritaires – même pour les animaux de compagnie.

Pourquoi Halloween continue de commencer plus tôt

Bien qu’aucune recherche définitive n’établisse pourquoi la fête d’Halloween commence plus tôt chaque année, l’augmentation des dépenses commerciales pourrait être l’un des principaux facteurs.

Les produits d’Halloween sont saisonniers, ce qui signifie que personne ne veut acheter des squelettes en plastique géants le 1er novembre. À mesure que les dépenses totales augmentent, les commerçants commandent plus de stocks et le coût de stockage de quantités toujours plus importantes d’articles invendus jusqu’à l’année prochaine devient une variable plus importante.

Une fois que le retour sur investissement d’une saison devient suffisamment important, les commerçants commencent à commander et à exposer des marchandises bien avant qu’elles ne soient réellement nécessaires. Par exemple, les manteaux d’hiver commencent à apparaître dans les magasins au début de l’automne et disparaissent généralement lorsque la neige commence à tomber. C’est la même chose avec Halloween : les commerçants sortent les marchandises tôt pour s’assurer qu’elles ne soient pas coincées avec des marchandises invendues une fois la saison terminée.

De plus, ils fixent souvent des prix stratégiques, en facturant le prix fort lorsque les articles arrivent pour la première fois sur les étagères, en attirant les acheteurs précoces, impatients, puis en baissant les prix à l’approche des vacances. Cela permet de vider les étagères et les entrepôts et de faire de la place pour la prochaine saison.

Au cours des deux dernières décennies, Halloween est devenue une fête commerciale de plus en plus importante. L’augmentation du nombre de personnes profitant des vacances et l’augmentation des dépenses ont fait d’Halloween un régal géant pour les entreprises. L’enjeu pour les commerçants est d’empêcher son commencement avant le 4 juillet…

The Conversation

Jay L. Zagorsky 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 Halloween commence-t-elle beaucoup plus tôt chaque année ? – https://theconversation.com/pourquoi-halloween-commence-t-elle-beaucoup-plus-tot-chaque-annee-268306

Why US activists are wearing inflatable frog costumes at protests against Trump

Source: The Conversation – Global Perspectives – By Blake Lawrence, PhD Candidate (Design) and Performance Artist, University of Technology Sydney

Three frogs, a shark, a unicorn and a Tyrannosaurus rex dance in front of a line of heavily armoured police in riot gear.

Over the past few weeks, activists taking part in protests against Immigration and Customs Enforcement (ICE) across the United States have donned inflatable animal costumes. The aim is to disrupt the Trump administration’s claim that the protests are violent “hate America” rallies.

The result is a sight to behold, with many encounters between police abd protestors going viral.

Whether they know it or not, these costumed activists are contributing to a rich history of using humour and dress to mobilise against and challenge power.

The ICE crackdowns

Since its creation in 2003, ICE has enforced immigration laws on the ground, arresting, detaining and deporting undocumented immigrants convicted of criminal activity.

During Donald Trump’s first term as president (2017–2021), the agency expanded its operations to target and deport many people with no criminal record.

This expansion sparked the June 2018 Occupy ICE protests, inspired by the broader global Occupy movement challenging corporate power and economic inequality.

The first major Occupy ICE action in 2018 occurred in Portland – a city known for its creativity and dissent. It grew from a rally organised by the Direct Action Alliance into what federal officials called a “very, very peaceful” encampment with kitchen tents, kids’ spaces and media hubs.

The protesters forced the temporary closure of the facility for about eight days, before federal officers cleared the site and erected a fence around its perimeter.

Following Trump’s re-election this year, ICE operations have intensified again, with the repealing of policies that prevented enforcement operations in sensitive areas such as schools and hospitals. Protests have followed.

In Portland, tensions escalated again this September, when Trump described the city as “burning to the ground” and “overrun with domestic terrorists,” announcing his plans to deploy the National Guard.

A federal judge has so far blocked Trump from doing so, saying the protests don’t meet the requirements for rebellion. He will likely keep trying.

Operation inflation

Protesters in Portland and across the US have long used humour and costume in their demonstrations. In October, a TikTok video showing an ICE agent spraying pepper spray into the air vent of an activist’s inflatable frog costume amassed more than two million views.

The clip exposes the absurd levels of police force against peaceful demonstrators. The protester, Seth Todd, said his intention was to contradict the “violent extremists” narrative, and “make the president and the feds look dumb”.

The Portland frog has quickly became emblematic of resistance, appearing on shirts, signs and street art, including parodies of artist Shepard Fairey’s iconic OBEY design – the authoritarian face replaced by a cartoon amphibian surrounded by the words DON’T OBEY.

And the frog costume has spawned imitators, with creatures multiplying in protests across the country, including at the recent No Kings rallies. One group of activists launched Operation Inflation, a website that crowdfunds inflatable suits for protesters, aiming to make resistance more visible, playful and safe.

Strategic silliness

One example that echoes Portland’s blow-up menagerie is London’s Clandestine Insurgent Rebel Clown Army (CIRCA). Members of CIRCA dressed as clowns during anti-war protests in the early 2000s. They played tag around police lines, hugged officers, and marched in absurd choreography.

As scholar Eve Kalyva notes, such actions employ “strategic frivolity”: silliness or absurdity in a way that disrupts the scripts between police and protester. By appearing playful rather than menacing, costumed activists directly counter narratives that paint them as violent threats.

The Portland frog and its friends work with the same strategies of silliness. Their dancing and cartoon-like actions make it impossible to frame them as thugs. Their soft forms bounce in contrast to the hard utility of riot gear.

From suffragette sashes to handmaids

Beyond frivolity, activists throughout history have also used dress and costume to more serious effect. In Britain in the early 20th century, suffragettes wore coordinated purple, white and green sashes to project unity in the fight for women’s voting rights.

In the US, dress and costume have played important roles in successive movements for African American liberation. During the 50s and 60s Civil Rights Movements, many marched in their best suits and dresses to assert their dignity against dehumanising racism.

The Black Panther Party had an unofficial uniform of sunglasses, berets and black leather jackets, embodying a more defiant style.

More recently, demonstrators in the US, Northern Ireland and Argentina have donned the red cloaks and white bonnets of The Handmaid’s Tale to protest abortion bans.

Similarly, The Extinction Rebellion–affiliated group Red Rebel Brigade stages actions in flowing red robes to mourn environmental loss.

And the wearing of the fishnet-patterned keffiyeh has now become a global symbol of Palestinian support.

Naked solidarity

On October 12, Portland’s anti-ICE demonstrators – many in their inflatable suits — were joined by thousands of naked cyclists in the Emergency World Naked Bike Ride. As costume designer and historian Camille Benda writes in Dressing The Resistance: The Visual Language of Protest (2021), nakedness in protest lays bare the body’s vulnerability to state violence.

In Portland, the mix of bare skin and soft blow-up animals heightens both the absurdity and tenderness of the scene. These protesters offer new avenues for direct action at a time when many people’s rights and freedoms are at stake.

At the time of writing, ICE was reported to have increased its weapons budget by 700% from last year.

Whether Trump will ultimately deploy the National Guard remains unclear. But across the US, the frogs (and their friends) keep multiplying. Their placards declaring “frogs together strong” remind us of the strength to be forged in unity and laughter.

The Conversation

Blake Lawrence 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. Why US activists are wearing inflatable frog costumes at protests against Trump – https://theconversation.com/why-us-activists-are-wearing-inflatable-frog-costumes-at-protests-against-trump-267975

High-tech cameras capture the secrets of venomous snake bites

Source: The Conversation – Global Perspectives – By Alistair Evans, Professor, School of Biological Sciences, Monash University

A pit viper (_Bothrops asper_). marcozozaya/iNaturalist, CC BY-SA

For more than 60 million years, venomous snakes have slithered across Earth.

These ancient, chemical weapon-wielding reptiles owe their evolutionary success in part to the effectiveness of their bite, which they deliver at an astonishing speed before their prey can escape.

Now, a study I coauthored reveals, in astonishing detail, exactly how these bites work. Published today in the Journal of Experimental Biology, it is the largest study of its kind to-date, and uses advanced video techniques to show how various snake species have evolved very different strategies to deliver their deadly bites.

Thousands of snakes on Earth

There are approximately 4,000 species of snake on Earth – about 600 of which are venomous.

Scientists started visually recording the strikes of these snakes to better understand them in the 1950s, when high-speed photography and cinematography were first developed.

Since then, these technologies have improved dramatically, allowing scientists to capture and study the action of venomous snake bites in much greater detail. For example, past research has shown there are clear differences between strikes to capture prey, versus those used for defence.

But most recent studies that have examined snake bites have been limited by a number of factors.

Firstly, they have captured the bites using only one camera. This means we only get a side-on view, whereas the snakes can slither in all directions. Secondly, the recordings have been of a relatively low resolution – in large part because they were made in the field with low lighting conditions. Thirdly, they have often focused on a single snake species or a limited number of species. This means we miss out on seeing how many other species may behave differently, or strike faster.

Cameras and lights surrounding a plexi glass box.
Experimental setup for snake strikes.
Silke Cleuren

Welcome to Venomworld

For our new study, my colleagues and I studied the bites of 36 different species of venomous snakes. These species were from the three main families of venomous snakes: vipers, elapids and colubrids. They included western diamondback rattlesnakes (Crotalus atrox), blunt-nosed vipers (Macrovipera lebetinus) and the rough-scaled death adder (Acanthophis rugosus).

All the snakes we studied were housed at an institution in Paris, France, called Venomworld. There, we built a small experimental arena consisting of plexiglass panels lined with a cardboard floor, in which we placed the individual snakes.

We presented the snakes with a simulated food source – a cylindrical hunk of medical gel, heated to 38 degrees so it resembled prey for those that can detect heat.

Two high-speed cameras, placed nearby at different angles, automatically captured the snakes striking the gel at 1,000 frames per second.

Using the footage from these two different views, we recreated the strike in 3D to investigate, in detail, its various components such as its duration, acceleration, angle, and how fast the snake’s jaw opened.

In total, we captured 108 videos of successful strikes – three for each of the species included in the study.

Striking and slashing

There were major differences between the strikes of the snakes we studied.

Vipers struck the fastest, moving at speeds of more than 4.5 metres per second before sinking their needle-like fangs into the fake prey. Sometimes they would quickly remove and reinsert their fangs at a better angle. Only when the fangs were comfortably in place did the snakes shut their jaws and inject venom.

Some 84% of the vipers included in the study reached their prey in less than 90 milliseconds. This is faster than the average response time for a startled mammal – the preferred prey of many vipers in the wild.

On the other hand, elapid snakes, such as the Cape coral cobra (Aspidelaps lubricus), crept towards the fake prey before lunging and biting it repeatedly. Their jaw muscles would tense, releasing venom.

Colubrid snakes, such as the mangrove snake (Boiga dendrophila), which have fangs farther back in their mouths, lunged towards the prey from further away. With their jaws clamped over it, they’d make a sweeping motion from side to side. In doing so, they tore a gash in the gel to inject the maximum amount of venom.

Our previous research highlighted how the shape of snakes’ fangs is closely tied to prey preference. We can now show how they use these deadly weapons in the blink of an eye – and why they have been able to survive for so long on Earth.

The Conversation

Alistair Evans receives funding from the Australian Research Council and Monash University, and is an Honorary Research Affiliate with Museums Victoria.

ref. High-tech cameras capture the secrets of venomous snake bites – https://theconversation.com/high-tech-cameras-capture-the-secrets-of-venomous-snake-bites-267738