Google plans to power a new data center with fossil fuels, yet release almost no emissions – here’s how its carbon capture tech works

Source: The Conversation – USA (2) – By Ramesh Agarwal, Professor of Engineering, Washington University in St. Louis

Carbon capture and storage projects capture carbon dioxide emissions from industrial facilities and power plants and pipe them underground to geological formations. Nopphinan/iStock/Getty Images Plus

As AI data centers spring up across the country, their energy demand and resulting greenhouse gas emissions are raising concerns. With servers and energy-intensive cooling systems constantly running, these buildings can use anywhere from a few megawatts of power for a small data center to more than 100 megawatts for a hyperscale data center. To put that in perspective, the average large natural gas power plant built in the U.S. generates less than 1,000 megawatts.

When the power for these data centers comes from fossil fuels, they can become major sources of climate-warming emissions in the atmosphere – unless the power plants capture their greenhouse gases first and then lock them away.

Google recently entered into a unique corporate power purchase agreement to support the construction of a natural gas power plant in Illinois designed to do exactly that through carbon capture and storage.

So how does carbon capture and storage, or CCS, work for a project like this?

I am an engineer who wrote a 2024 book about various types of carbon storage. Here’s the short version of what you need to know.

How CCS works

When fossil fuels are burned to generate electricity, they release carbon dioxide, a powerful greenhouse gas that remains in the atmosphere for centuries. As these gases accumulate in the atmosphere, they act like a blanket, holding heat close to the Earth’s surface. Too high of a concentration heats up the Earth too much, setting off climate changes, including worsening heat waves, rising sea levels and intensifying storms.

Carbon capture and storage involves capturing carbon dioxide from power plants, industrial processes or even directly from the air and then transporting it, often through pipelines, to sites where it can be safely injected underground for permanent storage.

An illustration showing pipes from oil pumps and power plants to underground layers
A snapshot of some of the ways carbon capture and storage works. The pipelines into the oil layer, in black, and the oil well illustrate enhanced oil recovery.
Congressional Budget Office, U.S. Federal Government

The carbon dioxide might be transported as a supercritical gas – which is right at the phase change from liquid to gas and has the properties of both – or dissolved in a liquid. Once injected deep underground, the carbon dioxide can become permanently trapped in the geologic structure, dissolve in brine or become mineralized, turning it to rock.

The goal of carbon storage is to ensure that carbon dioxide can be kept out of the atmosphere for a long time.

Types of underground carbon storage

There are several options for storing carbon dioxide underground.

Depleted oil and natural gas reservoirs have plentiful storage space and the added benefit that most are already mapped and their limits understood. They already held hydrocarbons in place for millions of years.

Carbon dioxide can also be injected into working oil or gas reservoirs to push out more of those fossil fuels while leaving most of the carbon dioxide behind. This method, known as enhanced oil and gas recovery, is the most common one used by carbon capture and storage projects in the U.S. today, and one reason CCS draws complaints from environmental groups.

Volcanic basalt rock and carbonate formations are considered good candidates for safe and long-term geological storage because they contain calcium and magnesium ions that interact with carbon dioxide, turning it into minerals. Iceland pioneered this method using its bedrock of volcanic basalt for carbon storage. Basalt also covers most of the oceanic crust, and scientists have been exploring the potential for sub-seafloor storage reservoirs.

How Iceland uses basalt to turn captured carbon dioxide into solid minerals.

In the U.S., a fourth option likely has the most potential for industrial carbon dioxide storage – deep saline aquifers, which is what Google plans to use. These widely distributed aquifers are porous and permeable sediment formations consisting of sandstone, limestone or dolostone. They’re filled with highly mineralized groundwater that cannot be used directly for drinking water but is very suitable for storing CO2.

Deep saline aquifers also have large storage capacities, ranging from about 1,000 to 20,000 gigatons. In comparison, the nation’s total carbon emissions from fossil fuels in 2024 were about 4.9 gigatons.

As of fall 2025, 21 industrial facilities across the U.S. used carbon capture and storage, including industries producing natural gas, fertilizer and biofuels, according to the Global CCS Institute’s 2025 report. Five of those use deep saline aquifers, and the rest involve enhanced oil or gas recovery. Eight more industrial carbon capture facilities were under construction.

Google’s plan is unique because it involves a power purchase agreement that makes building the power plant with carbon capture and storage possible.

Google’s deep saline aquifer storage plan

Google’s 400-megawatt natural gas power plant, to be built with Broadwing Energy, is designed to capture about 90% of the plant’s carbon dioxide emissions and pipe them underground for permanent storage in a deep saline aquifer in the nearby Mount Simon sandstone formation.

The Mount Simon sandstone formation is a huge saline aquifer that lies underneath most of Illinois, southwestern Indiana, southern Ohio and western Kentucky. It has a layer of highly porous and permeable sandstone that makes it an ideal candidate for carbon dioxide injection. To keep the carbon dioxide in a supercritical state, that layer needs to be at least half a mile (800 meters) deep.

A thick layer of Eau Claire shale sits above the Mount Simon formation, serving as the caprock that helps prevent stored carbon dioxide from escaping. Except for some small regions near the Mississippi River, Eau Claire shale is considerably thick – more than 300 feet (90 meters) – throughout most of the Illinois basin.

The estimated storage capacity of the Mount Simon formation ranges from 27 gigatons to 109 gigatons of carbon dioxide.

The Google project plans to use an existing injection well site that was part of the first large-scale carbon storage demonstration in the Mount Simon formation. Food producer Archer Daniels Midland began injecting carbon dioxide there from nearby corn processing plants in 2012.

Carbon capture and storage has had challenges as the technology developed over the years, including a pipeline rupture in 2020 that forced evacuations in Satartia, Mississippi, and caused several people to lose consciousness. After a recent leak deep underground at the Archer Daniels Midland site in Illinois, the Environmental Protection Agency in 2025 required the company to improve its monitoring. Stored carbon dioxide had migrated into an unapproved area, but no threat to water supplies was reported.

Why does CCS matter?

Data centers are expanding quickly, and utilities will have to build more power capacity to keep up. The artificial intelligence company OpenAI is urging the U.S. to build 100 gigawatts of new capacity every year – doubling its current rate.

Many energy experts, including the International Energy Agency, believe carbon capture and storage will be necessary to slow climate change and keep global temperatures from reaching dangerous levels as energy demand rises.

The Conversation

Ramesh Agarwal 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. Google plans to power a new data center with fossil fuels, yet release almost no emissions – here’s how its carbon capture tech works – https://theconversation.com/google-plans-to-power-a-new-data-center-with-fossil-fuels-yet-release-almost-no-emissions-heres-how-its-carbon-capture-tech-works-270425

Sugar starts corroding your teeth within seconds – here’s how to protect your pearly whites from decay

Source: The Conversation – USA (3) – By José Lemos, Professor of Oral Biology, University of Florida

Sugar feeds the colonies of bacteria living in your mouth and surrounding your teeth. Andrii Zastrozhnov/iStock via Getty Images Plus

Between Halloween candy, Thanksgiving pies and holiday cookies, the end of the year is often packed with opportunities to consume sugar. But what happens in your mouth during those first minutes and hours after eating those sweets?

While you’re likely aware that eating too much sugar can cause cavities – that is, damage to your teeth – you might be less familiar with how bacteria use those sugars to build a sticky film called plaque on your teeth as soon as you take that first sweet bite.

We are a team of microbiologists that studies how oral bacteria cause tooth decay. Here’s what happens in your mouth the moment sugar passes your lips – and how to protect your teeth:

An acid plunge

Within seconds of your first bite or sip of something sugary, the bacteria that make the human mouth their home start using those dietary sugars to grow and multiply. In the process of converting those sugars into energy, these bacteria produce large quantities of acids. As a result, just a minute or two after consuming high-sugar foods or drinks, the acidity of your mouth increases into levels that can dissolve enamel – that is, the minerals making up the surface of your teeth.

An array of cookies, cakes, candies and other sweets
Sweets present a delicious assault on your teeth.
Nazar Abbas Photography/Moment via Getty Images

Luckily, saliva comes to the rescue before these acids can start corroding the surface of your teeth. It washes away excess sugars while also neutralizing the acids in your mouth.

Your mouth is also home to other bacteria that compete with cavity-causing bacteria for resources and space, fighting them off and restoring the acidity of your mouth to levels that aren’t harmful to teeth.

However, frequent consumption of sweets and sugary drinks can overfeed harmful bacteria in a way that neither saliva nor helpful bacteria can overcome.

An assault on enamel

Cavity-causing bacteria also use dietary sugars to make a sticky layer called a biofilm that acts like a fortress attached to the teeth. Biofilms are very hard to remove without mechanical force, such as from routinely brushing your teeth or cleaning at the dentist’s office.

Microbes form vast communities called biofilms.

In addition, biofilms impose a physical barrier that restricts what crosses its border, such that saliva can no longer do its job of neutralizing acid as well. To make matters worse, while cavity-causing bacteria are able to survive in these acidic conditions, the good bacteria fighting them cannot.

In these protected fortresses, cavity-causing bacteria are able to keep multiplying, keeping the acidity level of the mouth elevated and leading to further loss of tooth minerals until a cavity becomes visible or painful.

How to protect your (sweet) teeth

Before eating your next sugary treat, there are a few measures you can take to help keep the cavity-forming bacteria at bay and your teeth safe.

First, try to reduce the amount of sugar you eat and consume your sugary food or drink during a meal. This way, the increased saliva production that occurs while eating can help wash away sugars and neutralize acids in your mouth.

In addition, avoid snacking on sweets and sugary drinks throughout the day, especially those containing table sugar or high-fructose corn syrup. Continually exposing your mouth to sugar will keep its acidity level higher for longer periods of time.

Finally, remember to brush regularly, especially after meals, to remove as much dental plaque as possible. Daily flossing also helps remove plaque from areas that your toothbrush cannot reach.

The Conversation

José Lemos receives funding from NIH and Vaxcyte.

Jacqueline Abranches receives funding from NIH/NIDCR and Vaxcyte.

ref. Sugar starts corroding your teeth within seconds – here’s how to protect your pearly whites from decay – https://theconversation.com/sugar-starts-corroding-your-teeth-within-seconds-heres-how-to-protect-your-pearly-whites-from-decay-269352

We are hardwired to sing − and it’s good for us, too

Source: The Conversation – USA (3) – By Elinor Harrison, Faculty Affiliate, Philosophy-Neuroscience-Psychology, Washington University in St. Louis

Gospel choir director Clyde Lawrence performs at the New Orleans Jazz & Heritage Festival on April 25, 2025.
AP Photo/Gerald Herbert

On the first Sunday after being named leader of the Catholic Church in May 2025, Pope Leo XIV stood on the balcony of St. Peter’s Basilica in Rome and addressed the tens of thousands of people gathered. Invoking tradition, he led the people in noontime prayer. But rather than reciting it, as his predecessors generally did, he sang.

In chanting the traditional Regina Caeli, the pope inspired what some have called a rebirth of Gregorian chant, a type of monophonic and unaccompanied singing done in Latin that dates back more than a thousand years.

The Vatican has been at the forefront of that push, launching an online initiative to teach Gregorian chant through short educational tutorials called “Let’s Sing with the Pope.” The stated goals of the initiative are to give Catholics worldwide an opportunity to “participate actively in the liturgy” and to “make the rich heritage of Gregorian chant accessible to all.”

These goals resonated with me. As a performing artist and scientist of human movement, I spent the past decade developing therapeutic techniques involving singing and dancing to help people with neurological disorders. Much like the pope’s initiative, these arts-based therapies require active participation, promote connection, and are accessible to anyone. Indeed, not only is singing a deeply ingrained human cultural activity, research increasingly shows how good it is for us.

The same old song and dance

For 15 years, I worked as a professional dancer and singer. In the course of that career, I became convinced that creating art through movement and song was integral to my well-being. Eventually, I decided to shift gears and study the science underpinning my longtime passion by looking at the benefits of dance for people with Parkinson’s disease.

The neurological condition, which affects over 10 million people worldwide, is caused by neuron loss in an area of the brain that is involved in movement and rhythmic processing – the basal ganglia. The disease causes a range of debilitating motor impairments, including walking instability.

An older woman sings from her music sheet.
A woman sings as part of a chorus for Parkinson’s patients and their care partners at a YMCA in Hanover, Mass., on Feb. 13, 2019.
David L. Ryan/The Boston Globe via Getty Images

Early on in my training, I suggested that people with Parkinson’s could improve the rhythm of their steps if they sang while they walked. Even as we began publishing our initial feasibility studies, people remained skeptical. Wouldn’t it be too hard for people with motor impairment to do two things at once?

But my own experience of singing and dancing simultaneously since I was a child suggested it could be innate. While Broadway performers do this at an extremely high level of artistry, singing and dancing are not limited to professionals. We teach children nursery rhymes with gestures; we spontaneously nod our heads to a favorite song; we sway to the beat while singing at a baseball game. Although people with Parkinson’s typically struggle to do two tasks at once, perhaps singing and moving were such natural activities that they could reinforce each other rather than distract.

A scientific case for song

Humans are, in effect, hardwired to sing and dance, and we likely evolved to do so. In every known culture, evidence exists of music, singing or chanting. The oldest discovered musical instruments are ivory and bone flutes dating back over 40,000 years. Before people played music, they likely sang. The discovery of a 60,000-year-old hyoid bone shaped like a modern human’s suggests our Neanderthal ancestors could sing.

In “The Descent of Man,” Charles Darwin speculated that a musical protolanguage, analogous to birdsong, was driven by sexual selection. Whatever the reason, singing and chanting have been integral parts of spiritual, cultural and healing practices around the world for thousands of years. Chanting practices, in which repetitive sounds are used to induce altered states of consciousness and connect with the spiritual realm, are ancient and diverse in their roots.

Though the evolutionary reasons remain disputed, modern science is increasingly validating what many traditions have long held: Singing and chanting can have profound benefits to physical, mental and social health, with both immediate and long-term effects.

Physically, the act of producing sound can strengthen the lungs and diaphragm and increase the amount of oxygen in the blood. Singing can also lower heart rate and blood pressure, reducing the risk of cardiovascular diseases.

Vocalizing can even improve your immune system, as active music participation can increase levels of immunoglobulin A, one of the body’s key antibodies to stave off illness.

Singing also improves mood and reduces stress.

Studies have shown that singing lowers cortisol levels, the primary stress hormone, in healthy adults and people with cancer or neurologic disorders. Singing may also rebalance autonomic nervous system activity by stimulating the vagus nerve and improving the body’s ability to respond to environmental stresses. Perhaps this is why singing has been called “the world’s most accessible stress reliever.”

A woman sings from a church podium.
A woman performs a Gregorian chant on Christmas Eve in 2023 in Spain.
saac Buj/Europa Press via Getty Images

Moreover, chanting may make you aware of your inner states while connecting to something larger. Repetitive chanting, as is common in rosary recitation and yogic mantras, can induce a meditative state, inducing mindfulness and altered states of consciousness. Neuroimaging studies show that chanting activates brainwaves associated with suspension of self-oriented and stress-related thoughts.

Singing as community

Singing alone is one thing, but singing with others brings about a host of other benefits, as anyone who has sung in a choir can likely attest.

Group singing provides a mood boost and improves overall well-being. Increased levels of neurotransmitters such as dopamine, serotonin and oxytocin during singing may promote feelings of social connection and bonding.

When people sing in unison, they synchronize not just their breath but also their heart rates. Heart rate variability, a measure of the body’s adaptability to stress, also improves during group singing, whether you’re an expert or a novice.

In my own research, singing has proven useful in yet another way: as a cue for movement. Matching footfalls to one’s own singing is an effective tool for improving walking that is better than passive listening. Seemingly, active vocalization requires a level of engagement, attention and effort that can translate into improved motor patterns. For people with Parkinson’s, for example, this simple activity can help them avoid a fall. We have shown that people with the disease, in spite of neural degeneration, activate similar brain regions as healthy controls. And it works even when you sing in your head.

Whether you choose to sing with the pope or not, you don’t need a mellifluous voice like his to raise your voice in song. You can sing in the shower. Join a choir. Chant that “om” at the end of yoga class. Releasing your voice might be easier than you think.

And, besides, it’s good for you.

The Conversation

Elinor Harrison received funding from the National Institutes of Health, the National Endowment for the Arts and the Grammy Museum Foundation. She is affiliated with the International Association of Dance Medicine and Science and the Society for Music Perception and Cognition.

ref. We are hardwired to sing − and it’s good for us, too – https://theconversation.com/we-are-hardwired-to-sing-and-its-good-for-us-too-262861

DNA from soil could soon reveal who lived in ice age caves

Source: The Conversation – UK – By Gerlinde Bigga, Scientific Coordinator of the Leibniz Science Campus "Geogenomic Archaeology Campus Tübingen", University of Tübingen

The team at GACT has been analysing sediments from Hohle Fels cave in Germany.

The last two decades have seen a revolution in scientists’ ability to reconstruct the past. This has been made possible through technological advances in the way DNA is extracted from ancient bones and analysed.

These advances have revealed that Neanderthals and modern humans interbred – something that wasn’t previously thought to have happened. It has allowed researchers to disentangle the various migrations that shaped modern people. It has also allowed teams to sequence the genomes of extinct animals, such as the mammoth, and extinct agents of disease, such as defunct strains of plague.

While much of this work has been carried out by analysing the physical remains of humans or animals, there is another way to obtain ancient DNA from the environment. Researchers can now extract and sequence DNA (determine the order of “letters” in the molecule) directly from cave sediments rather than relying on bones. This is transforming the field, known as palaeogenetics.




Read more:
When did kissing evolve and did humans and Neanderthals get off with each other? New research


Caves can preserve tens of thousands of years of genetic history, providing ideal archives for studying long-term human–ecosystem interactions. The deposits beneath our feet become biological time capsules.

It is something we are exploring here at the Geogenomic Archaeology Campus Tübingen (GACT) in Germany. Analysing DNA from cave sediments allows us to reconstruct who lived in ice age Europe, how ecosystems changed and what role humans played. For example, did modern humans and Neanderthals overlap in the same caves? It’s also possible to obtain genetic material from faeces left in caves. At the moment we are analysing DNA from the droppings of a cave hyena that lived in Europe around 40,000 years ago.

The oldest sediment DNA discovered so far comes from Greenland and is two million years old.

Palaeogenetics has come a long way since the first genome of an extinct animal, the quagga, a close relative of modern zebras, was sequenced in 1984. Over the past two decades, next-generation genetic sequencing machines, laboratory robotics and bioinformatics (the ability to analyse large, complex biological datasets) have turned ancient DNA from a fragile curiosity into a high-throughput scientific tool.

The sediment samples from Hohle Fels are divided up for different analysis methods. Some go to the clean room, some to the geochemical laboratory.
The sediment samples from Hohle Fels are divided up for different analysis methods. Some go to the clean room, some to the geochemical laboratory.

Today, sequencing machines can decode up to a hundred million times more DNA than their early predecessors. Where the first human genome took over a decade to complete, modern laboratories can now sequence hundreds of full human genomes in a single day.

In 2022, the Nobel prize in physiology or medicine was awarded to Svante Pääbo, a leading light in this field. It highlighted the global significance of this research. Ancient DNA now regularly makes headlines, from attempts to recreate mammoth-like elephants, to tracing hundreds of thousands of years of human presence in parts of the world. Crucially, advances in robotics and computing have allowed us to recover DNA from sediments as well as bones.

GACT is a growing research network based in Tübingen, Germany, where three institutions collaborate across disciplines to establish new methods for finding DNA in sediments. Archaeologists, geoscientists, bioinformaticians, microbiologists and ancient-DNA specialists combine their expertise to uncover insights that no single field could achieve alone — a collaboration in which the whole genuinely becomes greater than the sum of its parts.

The network extends well beyond Germany. International partners enable fieldwork in
archaeological cave sites and natural caves all over the world. This summer, for example, the team investigated cave sites in Serbia, collecting several hundred sediment samples for ancient DNA and related ecological analyses. Future work is planned in South Africa and the western United States to test the limits of ancient DNA preservation in sediments from different environments and time periods.

Excavation in Serbia
Work underway at a cave site in Serbia.

A needle in a haystack

Recovering DNA from sediments sounds simple: take a scoop, extract, sequence. In reality, it is far more complex. The molecules are scarce, degraded and fragmented, and mixed with modern contamination from cave visitors and wildlife. Detecting authentic ice age molecules relies on subtle chemical damage patterns to the DNA itself, ultra-clean laboratories, robotic extraction, and specialised bioinformatics. Every positive identification is a small triumph, revealing patterns invisible to conventional archaeology.

Much of GACT’s work takes place in the caves of the Swabian Jura within Unesco World Heritage sites such as Hohle Fels, home to the world’s oldest musical instruments and figurative art. Neanderthals and Homo sapiens left behind stone artefacts, bones, ivory and sediments that accumulated over tens of millennia. Caves are natural DNA archives, where stable conditions preserve fragile biomolecules, enabling researchers to build up a genetic history of ice age Europe.

One of the most exciting aspects of sediment DNA research is its ability to detect species long gone, even when no bones or artefacts remain. A particular focus lies on humans: who lived in the cave, and when? How modern humans and Neanderthals use the caves and, as mentioned, were they there at the same times? Did cave bears and humans compete for shelter and resources? And what might the microbes that lived alongside them reveal about the impact humans had on past ecosystems?

Sediment DNA also traces life outside the cave. Predators dragged prey into sheltered chambers, humans left waste behind. By following changes in human, animal and microbial DNA over time, researchers can examine ancient extinctions and ecosystem shifts, offering insights relevant to today’s biodiversity crisis.

The work is ambitious: using sedimentary DNA to reconstruct ice age ecosystems and to understand the ecological consequences of human presence. Only two years into GACT, every dataset generates new questions. Every cave layer adds another twist to the story.

With hundreds of samples now being processed, major discoveries lie ahead. Researchers expect soon to detect the first cave bear genomes, the earliest human traces, and complex microbial communities that once thrived in darkness. Will the sediments reveal all their secrets? Time will tell – but the prospects are exhilarating.

The Conversation

Gerlinde Bigga 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. DNA from soil could soon reveal who lived in ice age caves – https://theconversation.com/dna-from-soil-could-soon-reveal-who-lived-in-ice-age-caves-270318

Before trips to Mars, we need better protection from cosmic rays

Source: The Conversation – UK – By Zahida Sultanova, Post Doctoral Research Fellow, School of Biological Sciences, University of East Anglia

Frame Stock Footage/Shutterstock.com

The first step on the Moon was one of humanity’s most exciting accomplishments. Now scientists are planning return trips – and dreaming of Mars beyond.

Next year, Nasa’s Artemis II mission will send four astronauts to fly around the Moon to test the spacecraft before future landings. The following year, two astronauts are expected to explore the surface of the Moon for a week as part of Nasa’s Artemis III mission.

And finally, the trip to Mars is planned for the 2030s. But there’s an invisible threat standing in the way: cosmic rays.

When we look at the night sky, we see stars and nearby planets. If we’re lucky enough to live somewhere without light pollution, we might catch meteors sliding across the sky. But cosmic rays – consisting of protons, helium nuclei, heavy ions and electrons – remain hidden. They stream in from exploding stars (galactic cosmic rays) and our very own sun (solar particle events).

They don’t discriminate. These particles carry so much energy and move so fast that they can knock electrons off atoms and disrupt molecular structures of any material. That way, they can damage everything in their path, machines and humans alike.

The Earth’s magnetic field and atmosphere shield us from most of this danger. But outside Earth’s protection, space travellers will be routinely exposed. In deep space, cosmic rays can break DNA strands, disrupt proteins and damage other cellular components, increasing the risk of serious diseases such as cancer.

The research challenge is straightforward: measure how cosmic rays affect living organisms, then design strategies to reduce their damage.

Ideally, scientists would study these effects by sending tissues, organoids (artificially made organ-like structures) or lab animals (such as mice) directly into space. That does happen, but it’s expensive and difficult. A more practical approach is to simulate cosmic radiation on Earth using particle accelerators.

Cosmic ray simulators in the US and Germany expose tissues, plants and animals to different components of cosmic rays in sequence. A new international accelerator facility being built in Germany will reach even higher energies, matching levels found in space that have never been tested on living organisms.

But these simulations aren’t fully realistic. Many experiments deliver the entire mission dose in a single treatment. This is like using a tsunami to study the effects of rain.

In real space, cosmic rays arrive as a mixture of high-energy particles hitting simultaneously, not one type at a time. My colleagues and I have suggested building a multi-branch accelerator that could fire several tuneable particle beams at once, recreating the mixed radiation of deep space under controlled laboratory conditions. For now, though, this kind of facility exists only as a proposal.

Beyond better testing, we need better protection. Physical shields seem like the obvious first defence. Hydrogen-rich materials such as polyethylene and water-absorbing hydrogels can slow charged particles. Although they are used, or planned to be used, as spacecraft materials, their benefits are limited.

Particularly galactic cosmic rays, the ones that arrive from far exploding stars, are so energetic that they can penetrate through physical shielding. They can even generate secondary radiation that increases exposure. So, effective protection by using solely physical shields remains a major challenge.

Nature’s armour

That’s why scientists are exploring biological strategies. One approach is to use antioxidants. These molecules can protect DNA from harmful chemicals that are produced when cosmic rays hit living cells.

Supplementing with CDDO-EA, a synthetic antioxidant, reduces cognitive damage caused by simulated cosmic radiation in female mice. In the study, mice exposed to simulated cosmic radiation learned a simple task more slowly compared to unexposed mice. However, mice that received the synthetic antioxidant performed normally despite being exposed to simulated cosmic radiation.

Another approach involves learning from organisms with extraordinary abilities. Hibernating organisms become more resistant to radiation during hibernation. The mechanisms on how hibernation protects from radiation are not fully understood yet. Still, inducing hibernation-like conditions in non-hibernating animals is possible and can make them more radioresistant.

Tardigrades – microscopic creatures also known as water bears – are also extremely radioresistant, especially when dehydrated. Although we can’t hibernate or dehydrate astronauts, the strategies these organisms use to protect cellular components might help us preserve other organisms during long space journeys.

Microbes, seeds, simple food sources and even animals that could later become our companions might be kept in a protected state for a while. Under calmer conditions, they could then be brought back to full activity. Therefore, understanding and harnessing these protective mechanisms could prove crucial for future space journeys.

A third strategy focuses on supporting organisms’ own stress responses. Stressors on Earth, such as starvation or heat, have driven organisms to evolve cellular defences that protect DNA and other cellular components. In a recent preprint (a paper that is yet to be peer reviewed), my colleague and I suggest that activating these mechanisms through specific diets or drugs may offer additional protection in space.

Physical shields alone won’t be enough. But with biological strategies, more experiments in space and on Earth, and the construction of new dedicated accelerator complexes, humanity is getting closer to making routine space travel a reality. With current speed, we are probably decades away from fully solving cosmic-ray protection. Greater investment in space radiation research could shorten that timeline.

The ultimate goal is to journey beyond Earth’s protective bubble without the constant threat of invisible, high-energy particles damaging our bodies and our spacecraft.

The Conversation

Dr. Zahida Sultanova works for the University of East Anglia and is funded by the Leverhulme Trust. She is a member of European Society of Evolutionary Biology (ESEB) and Ecology and Evolutionary Biology Society of Turkey (EkoEvo).

ref. Before trips to Mars, we need better protection from cosmic rays – https://theconversation.com/before-trips-to-mars-we-need-better-protection-from-cosmic-rays-268934

The Beatles’ movie Help! featured crude racial stereotypes – but it shouldn’t be hidden away

Source: The Conversation – UK – By Philip Murphy, Director of History & Policy at the Institute of Historical Research and Professor of British and Commonwealth History, School of Advanced Study, University of London

I sometimes think that my teenage fascination with the Beatles is what drew me to becoming a professional historian. Piecing together what I could find out about them in the years before the internet was a sort of gateway to the history of Britain and the world in the decade in which I was born – Carnaby Street, the Vietnam War, Richard Nixon and counter-cultural figures like Timothy Leary.

The original Beatles Anthology released in 1995 in the form of three albums and a documentary series was undoubtedly a treat for Beatles fans. Recently an updated version of the Anthology arrived in the shops. The new release includes a fourth CD of unreleased tracks.

It is always thrilling to hear iconic tracks at an earlier stage of their gestation. And this is essentially what the recently released additional material offers. However, the true obsessives among us have heard much of the Anthology material from bootleg collections. What does remain as hard to come by as ever are some of the films.

At a time when a fan had to be grateful for what they were given, I can still remember the excitement of learning that the BBC was planning to show all the band’s films over the Christmas of 1979. If we are, indeed, in the “barrel-scraping” phase, as one critic dubbed the new Anthology, of Beatles commemoration, it is surprising how difficult it now is to access some of those films.

In the last ten years some work has done to make some of the films more accessible. The band’s first movie, A Hard Day’s Night (1964), directed by Richard Lester, was re-released in cinemas in 2014 to mark its 50th anniversary. It is currently available on the BFI’s streaming service.

Their swan-song film, Let it Be (1970) was remastered for Disney+ in 2024 by Peter Jackson. Jackson had previously spliced together hours of unused footage from director Michael Lindsay-Hogg’s original recording sessions to create the 2021 documentary Get Back.

Although some are yet to be remastered. The band’s 1968 well-regarded animated movie Yellow Submarine, is still awaiting an authorised re-release, although no doubt this will come. Their dismal 1967 BBC Christmas special Magical Mystery Tour was notoriously dead-on-arrival and if there are commercial reasons for resuscitating it, there certainly aren’t any artistic ones.

But what about Help! (1965), the band’s second outing with Richard Lester? The film’s madcap plot involves the group being chased around the globe by the comically inept members of a religious cult keen to recover a sacred ring from the finger of the band’s drummer, Ringo Starr.

It is a far more accomplished piece of filmmaking than Magical Mystery Tour. Indeed, it was in many ways ground-breaking for pioneering the music video format and rock musicals. But the last DVD release of the movie was a 2007 two-disc set.




Read more:
Anthology 4 shows there’s still more to discover about the Beatles


The reason why the film has missed out on more recent celebratory repackaging isn’t difficult to surmise: it features three familiar European character actors – Leo McKern, Eleanor Bron and John Bluthal – adopting “brown-face” to portray Indian cult members. And their quest for the ring is in order to enable them to carry out a human sacrifice. No mention is made of any of this in the documentary series that accompanied the Anthology recordings, and which has also been re-released.

As the 1960s progressed, these sorts of crude orientalist stereotypes faced parody and criticism. But apologists for the movie would struggle to demonstrate that Help! is doing anything other than reinforcing those attitudes. Some contemporary critics have simply labelled it as racist.

I wonder if an attempt could be made to salvage Help! by re-releasing it with its own documentary package exploring the historical context of the film. If the choice is probably between either contextualisation or simply allowing the movie to languish in the far-corners of eBay to avoid offending global consumers, then I think we should go for the former.

While it would be difficult to make Help! genuinely palatable to contemporary viewers, it could be used as the starting point for a fascinating exploration of the ways in which Britain in the Swinging Sixties viewed its colonial past.

Some of the era’s more radical writers and filmmakers like Edward Bond and Tony Richardson were keen to question the values of their parents’ generation. But as Help! demonstrates, imperial assumptions of white racial superiority continued to permeate popular culture, not least in the area of comedy.

If the Beatles of 1965 had passively accepted the plot of Help!, the Beatles of the late 60s would almost certainly have baulked at it. George Harrison famously embraced Indian music, culture and religion. John Lennon would subsequently feature in another Richard Lester film, How I Won the War (1967), which mocked British jingoism and its rigid class system.

A year later, Lennon had to face racist abuse from the British press and fans when he left his wife for the Japanese artist, Yoko Ono. Also, the track Commonwealth, which surfaced in the 2021 documentary Get Back, is an improvisation satirising Enoch Powell’s Rivers of Blood speech, which was held responsible for inspiring a spate of racist attacks.

The Beatles were on a journey, and Help! deserves to be seen and discussed as part of that journey, rather than being hidden away.


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The Conversation

Philip Murphy has received funding from the AHRC and is a member of the European Movement UK.

ref. The Beatles’ movie Help! featured crude racial stereotypes – but it shouldn’t be hidden away – https://theconversation.com/the-beatles-movie-help-featured-crude-racial-stereotypes-but-it-shouldnt-be-hidden-away-270526

Google is relying on its own chips for its AI system Gemini. Here’s why that’s a seismic change for the industry

Source: The Conversation – UK – By Alaa Mohasseb, Senior Lecturer in Artificial Intelligence and Machine Learning, University of Portsmouth

For many years, the US company Nvidia shaped the foundations of modern artificial intelligence. Its graphics processing units (GPUs) are a specialised type of computer chip originally designed to handle the processing demands of graphics and animation. But they’re also great for the repetitive calculations required by AI systems.

Thus, these chips have powered the rapid rise of large language models – the technology behind AI chatbots – and they have became the familiar engine behind almost every major AI breakthrough.

This hardware sat quietly in the background while most of the attention was focused on algorithms and data. Google’s decision to train Gemini on its own chips, called tensor processing units (TPUs) changes that picture. It invites the industry to look directly at the machines behind the models and to reconsider assumptions that long seemed fixed.

This moment matters because the scale of AI models has begun to expose the limits
of general purpose chips. As models grow, the demands placed on processing systems
increases to levels that make hidden inefficiencies impossible to ignore.

Google’s reliance on TPUs reveals an industry that is starting to understand that hardware choices are not simply technical preferences but strategic commitments that determine who can lead the next wave of AI development.

Google’s Gemini relies on cloud systems that simplify the challenging task of coordinating devices during large-scale training (improvement) of AI models.

The design of these different chips reflects a fundamental difference in intention. Nvidia’s GPUs are general purpose and flexible enough to run a wide range of tasks. TPUs were created for the narrow mathematical operations at the heart of AI models.

Independent comparisons highlight that TPU v5p pods can outperform high-end Nvidia systems on workloads tuned for Google’s software ecosystem. When the chip architecture, model structure and software stack align so closely, improvements in speed and efficiency become natural rather than forced.

These performance characteristics also reshape how quickly teams can experiment. When hardware works in concert with the models it is designed to train, iteration becomes faster and more scalable. This matters because the ability to test ideas quickly often determines which organisations innovate first.

These technical gains are only one part of the story. Training cutting-edge AI systems is expensive and requires enormous computing resources. Organisations that rely only on GPUs face high costs and increasing competition for supply. By developing and depending on its own hardware, Google gains more control over pricing, availability and long-term strategy.

Analysts have noted that this internal approach positions Google with lower operational costs while reducing dependence on external suppliers for chips. A particularly notable development came from Meta as it explored a multi-billion dollar agreement to use TPU capacity.

When one of the largest consumers of GPUs evaluates a shift toward custom accelerators, it signals more than curiosity. It suggests growing recognition that relying on a single supplier may no longer be the safest or most efficient strategy in an industry where hardware availability shapes competitiveness.

These moves also raise questions about how cloud providers will position themselves. If TPUs become more widely available through Google’s cloud services, the rest of the market may gain access to hardware that was once considered proprietary. The ripple effects could reshape the economics of AI training far beyond Google’s internal research.

What This Means for Nvidia

Financial markets reacted quickly to the news. Nvidia’s stock fell as investors weighed the potential for cloud providers to split their hardware needs across more than one supplier. Even if TPUs do not replace GPUs entirely, their presence introduces competition that may influence pricing and development timelines.

The existence of credible alternatives pressures Nvidia to move faster, refine its offerings and appeal to customers who now see more than one viable path forward.
Even so, Nvidia retains a strong position. Many organisations depend heavily on CUDA (a computing platform and programming model developed by NVidia) and the large ecosystem of tools and workflows built around it.

Moving away from that environment requires significant engineering effort and may not be feasible for many teams. GPUs continue to offer unmatched flexibility for diverse workloads and will remain essential in many contexts.

However, the conversation around hardware has begun to shift. Companies building
cutting-edge AI models are increasingly interested in specialised chips tuned to their exact needs. As models grow larger and more complex, organisations want greater control over the systems that support them. The idea that one chip family can meet every requirement is becoming harder to justify.

Google’s commitment to TPUs for Gemini illustrates this shift clearly. It shows that custom chips can train world-class AI models and that hardware purpose-built for AI is becoming central to future progress.

It also makes visible the growing diversification of AI infrastructure. Nvidia remains dominant, but it now shares the field with alternatives that are increasingly capable of shaping the direction of AI development.

The foundations of AI are becoming more varied and more competitive. Performance
gains will come not only from new model architectures but from the hardware designed to support them.

Google’s TPU strategy marks the beginning of a new phase in which the path forward will be defined by a wider range of chips and by the organisations willing to rethink the assumptions that once held the industry together.

The Conversation

Alaa Mohasseb 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. Google is relying on its own chips for its AI system Gemini. Here’s why that’s a seismic change for the industry – https://theconversation.com/google-is-relying-on-its-own-chips-for-its-ai-system-gemini-heres-why-thats-a-seismic-change-for-the-industry-270818

Crise de la dette: les quatre leviers qui peuvent aider le Sénégal à éviter la restructuration

Source: The Conversation – in French – By Souleymane Gueye, Professor of Economics and Statistics, City College of San Francisco

Le Fonds monétaire international (FMI) a réévalué la dette du Sénégal à 132 % du PIB, entraînant une dégradation de sa note souveraine. Les discussions avec le FMI avancent lentement et le pays rencontre des difficultés pour lever des financements sur les marchés internationaux.

Malgré tout, la dette reste soutenable depuis 2024, mais elle place le Sénégal devant un dilemme : restructurer immédiatement ou poursuivre la stratégie actuelle, qui permet de rembourser les échéances sans accord avec le FMI et de maintenir son Plan de redressement économique et social.
.
En tant qu’économiste ayant étudié les relations entre le FMI et le Sénégal sur quarante ans, je ne préconise pas une restructuration de cette dette.

En dépit d’un besoin de financement de 5 800 milliards de F CFA pour 2025, il est préférable de poursuivre la trajectoire actuelle et le plan de redressement, tout en recherchant un accord avec le FMI, aligné sur la “Vision 2050”.

Qu’est-ce qu’une restructuration de la dette ?

Une restructuration de la dette est un « réaménagement négocié des obligations d’un État pour restaurer la soutenabilité de sa dette » . Elle intervient lorsque le pays n’est plus en mesure de payer ses dettes sans compromettre sa stabilité économique et sociale. Autrement dit, elle intervient en cas de défaut de paiement. Or, ce n’est pas la situation actuelle du Sénégal. Une restructuration vise surtout à alléger la pression financière et à redonner des marges budgétaires.




Read more:
Pourquoi la dernière dégradation de la note du Sénégal par Moody’s ne tient pas la route


Elle repose sur deux principes simples : un pays ne peut pas continuer à emprunter indéfiniment, et les créanciers ont parfois du mal à se coordonner entre eux.

Une restructuration peut prendre plusieurs formes :

  • réduction du principal (haircut) : le créancier accepte d’abandonner une partie de la somme due. C’est la solution la plus lourde, réservée aux situations de détresse sévère.

  • reprofilage : le pays paie tout, mais plus lentement et moins cher, parfois avec une période de grâce. Cela facilite l’ajustement budgétaire sans choc majeur.

  • rééchelonnement : report des échéances dans le temps, souvent sous l’égide du Club de Paris – un groupe informel de pays créanciers dont le rôle est coordonner la restructuration de la dette publique des États qui n’arrivent plus à rembourser leurs emprunts – ou de créanciers privés, avec des conditions financières assouplies.

  • cadre commun du G20 : restructuration globale et coordonnée entre tous les créanciers, visant à éviter les blocages, garantir la transparence et s’accompagner d’un programme macroéconomique avec le FMI.




Read more:
Sortir du piège de la dette : les alternatives au modèle FMI pour le Sénégal


Les implications économiques

Plusieurs études comme celle de l’économiste américain Barry Eichengreen montrent qu’une restructuration de la dette peut réduire fortement l’investissement privé, fragiliser les banques exposées aux titres publics et limiter l’accès du pays aux financements extérieurs. Elle augmente aussi les primes de risque et peut entraîner une crise de confiance.

Dans une économie comme celle du Sénégal, intégrée à l’Union économique et monétaire ouest-africaine (Uemoa) et sans politique monétaire indépendante, ces chocs sont très difficiles à absorber.

À long terme, une restructuration peut être utile si elle est bien pensée et accompagnée de réformes crédibles. Elle peut améliorer la structure de la dette, réduire les intérêts, libérer des marges pour les dépenses prioritaires et restaurer la confiance.

Mais ces avantages dépendent du maintien d’une dynamique de croissance non entravée par des ajustements trop brutaux. Ce qui est impossible à avoir avec le FMI.

Le Sénégal doit-il restructurer sa dette publique ?

Le Sénégal a un endettement très élevé, mais il reste soutenable selon le mode de calcul courant. On compare les dépenses obligatoires de l’État (salaires, transferts, dépenses de fonctionnement et d’investissement) à ses recettes. Puis, on vérifie si le service de la dette reste supportable. Selon ce calcul, basé sur la dernière loi de finances initiale, le Sénégal se situe dans la catégorie des pays à haut risque, mais pas en situation de défaut de paiement.

En revanche, les besoins de financement augmentent, et la confiance des marchés s’est affaiblie après la révélation des dettes cachées et l’absence d’accord avec le FMI.




Read more:
Sénégal : ce que révèle la dégradation de la note sur la dette cachée et les notations de crédit


Malgré ce contexte difficile, le Sénégal continue de payer sa dette, mais les taux d’intérêt très élevés aggravent le coût du service de la dette et réduisent les marges pour investir. Aujourd’hui, 16 % des recettes fiscales et 50 % des revenus de l’État servent à rembourser la dette, contre 25 % en moyenne en Afrique.

Cette situation peut-elle durer ? Une restructuration pourrait alléger la pression, car refuser d’y recourir expose le pays à un risque de crise de liquidité pouvant se transformer en crise financière et économique.

Ce contexte financier est très tendu, mais il reste, selon nous, soutenable. Il peut même s’améliorer si le pays exploite pleinement ses atouts. Le Sénégal dispose en effet d’un environnement prometteur qui peut éviter une restructuration immédiate de la dette.

Ces atouts tournent autour de ces facteurs :

  • Une population jeune, dynamique et entreprenante

  • Une stabilité politique et institutionnelle dans une région instable.

  • Une croissance potentielle solide (8 % -10 %), renforcée par le gaz, le pétrole et l’or.

  • Une administration fiscale et financière en constante amélioration grâce
    aux réformes récentes.

. Un potentiel enviable dans l’agrobusiness, les ressources halieutiques, les services et le numérique, et l’accès encore possible aux financements extérieurs confessionnels.

Eviter la restructuration du type FMI

Fort de ces atouts, le Sénégal doit éviter une restructuration encadrée par le FMI, car impliquant forcément un programme du FMI. Celui-ci est fondé sur des politiques bien connues :

• Une politique fiscale restrictive : forte réduction du déficit, diminution des dépenses publiques, élimination des subventions, hausse des impôts, licenciements administratifs,

• Une privatisation des entreprises publiques et para publiques,

• Une politique monétaire restrictive (augmentation du coût du crédit) si le pays dispose d’une politique monétaire autonome,

• Une libéralisation totale du secteur financier et du commerce extérieur.

Ces politiques risqueraient d’exacerber la contraction de l’activité économique au lieu de la résoudre car, du fait du régime de change fixe, le Sénégal ne dispose pas du levier monétaire et du taux de change pour atténuer les effets négatifs que ces mesures auraient sur l’activité économique.

Autrement dit, les déséquilibres budgétaires vont être rétablis au détriment d’une croissance économique endogène et inclusive, exacerbant les inégalités économiques et sociales, et la paupérisation des populations.

Entrer dans une restructuration maintenant créerait un cercle vicieux : une contraction de l’activité économique occasionnant une baisse des recettes et des difficultés à atteindre les objectifs du programme. Ce qui entraînera alors davantage d’austérité.

Il faudra donc tout faire pour éviter ce scénario et concevoir une autre stratégie pour desserrer la pression sur les finances publiques et mieux gérer la dette.

Une stratégie alternative

Éviter une restructuration immédiate ne veut pas dire rester passif. Il faut au contraire bâtir une stratégie solide autour de quatre leviers :

  • D’abord, privilégier une approche basée sur la transparence : terminer l’inventaire de la dette, publier tous les rapports et élaborer un plan de gestion conforme aux recommandations de la Cour des comptes. Cette approche devrait idéalement s’accompagner d’un accord formel avec le FMI pour valider le cadre macroéconomique proposé par le Sénégal et renforcer la transparence budgétaire, envoyant ainsi un signal fort de confiance aux marchés internationaux.

  • Le deuxième levier consiste à distinguer clairement la dette de l’État central de celle des entreprises publiques et des garanties souveraines.

Pour la dette centrale, le gouvernement sénégalais peut renégocier les maturités des Euro-obligations et prêts commerciaux à taux élevés sur le long terme sans une restructuration formelle. L’État doit chercher à convertir les prêts bilatéraux à court terme en financements concessionnels ou partenariats sectoriels, tout en privilégiant les financements auprès de partenaires bilatéraux et multilatéraux (Chine, Turquie, Inde, pays du Golfe).

Ce reprofilage partiel, conçu indépendamment du FMI, pourrait améliorer la liquidité et libérer des marges pour soutenir l’économie. L’État doit se concentrer sur les obligations à court terme (bons du Trésor et titres de moins de deux ans) pour refinancer, renégocier les taux ou prolonger les échéances, afin de ne pas déstabiliser le système bancaire de l’Uemoa.

  • Le troisième levier consiste à étaler l’ajustement fiscal sur plusieurs années, élargir l’assiette fiscale et engager une réforme axée sur l’équité. Le gouvernement doit aussi renforcer la gouvernance des régies financières et mettre en place une gestion efficace des revenus tirés du gaz, du pétrole et des autres ressources naturelles.

  • L’exploitation du gaz et du pétrole offre au Sénégal un levier supplémentaire : valoriser les revenus futurs pour négocier de meilleures conditions. La création d’un fonds de stabilisation et d’un cadre transparent d’exploitation de ces ressources peut réduire la charge de la dette et permettre d’investir dans la formation des jeunes, le capital humain et les services publics.




Read more:
Comment le Sénégal peut financer son économie sans s’endetter davantage


Que retenir ?

Tant que le FMI maintient ses conditions classiques ou retarde les négociations, le Sénégal ne devrait pas restructurer sa dette. La stratégie à suivre consiste à :

• Consolider graduellement les finances publiques en réduisant les dépenses de fonctionnement de l’État central et en fusionnant les directions et les agences publiques

• Préserver l’investissement public, relancer l’investissement privé et élaborer des mesures spécifiques de relance de la croissance economique;

• Négocier des conditions moins procycliques et contraignantes;

• Finaliser un programme avec le FMI basé sur la Vision 2050;

• Et n’envisager une restructuration qu’en dernier recours, dans un cadre structuré, repensé et adossé aux priorités économiques du gouvernement sénégalais et plus favorable.

Une dette bien analysée et bien gérée ne peut pas déboucher sur une défaillance économique. Au contraire, elle peut devenir un outil puissant de souveraineté pour favoriser le plein emploi, réduire la pauvreté et promouvoir la justice économique et sociale.

The Conversation

Souleymane Gueye receives funding from Monterey Institute of International Studies and the Fullbright foundation

ref. Crise de la dette: les quatre leviers qui peuvent aider le Sénégal à éviter la restructuration – https://theconversation.com/crise-de-la-dette-les-quatre-leviers-qui-peuvent-aider-le-senegal-a-eviter-la-restructuration-270177

Larry Summers’ sexism is jeopardizing his power and privilege, but the entire economics profession hinders progress for women

Source: The Conversation – USA (2) – By Yana van der Meulen Rodgers, Professor of Labor Studies, Rutgers University

Larry Summers attends a prestigious conference in July 2025 in Sun Valley, Idaho. Kevin Dietsch/Getty Images

House lawmakers released damning correspondence between economist Larry Summers and the late convicted sex offender Jeffrey Epstein on Nov. 12, 2025. The exchanges, which were among more than 20,000 newly released public documents, documented how Summers – a former U.S. Treasury secretary and Harvard University president – repeatedly sought Epstein’s advice while pursuing an intimate relationship with a woman he was mentoring.

The two men exchanged texts and emails until July 5, 2019, the day before Epstein was arrested on federal charges of the sex trafficking of minors. That was more than a decade after Epstein pleaded guilty to soliciting prostitution from a girl who was under 18. Epstein died by suicide that August, while in jail.

“As I have said before, my association with Jeffrey Epstein was a major error of judgement,” Summers wrote in a statement to The Crimson, Harvard’s newspaper, after the documents came to light. “I am deeply ashamed of my actions and recognize the pain they have caused,” he said in another statement.

The texts have ignited a new round of scrutiny of Summers and calls for Harvard to revoke his tenure.

Four women hold photos of Jeffrey Epstein aloft.
Protesters hold signs bearing photos of convicted sex criminal and Larry Summers confidante Jeffrey Epstein in front of a federal courthouse on July 8, 2019, in New York City.
Stephanie Keith/Getty Images

Prestigious career is unraveling

These revelations are leading to the unraveling of Summers’ prestigious career.

The 70-year-old economist went on leave from teaching at Harvard on Nov. 19. He has also stepped down from several boards on which he was serving, including Yale University’s Budget Lab, OpenAI and two think tanks – the Center for American Progress and the Center for Global Development.

In addition, Harvard has launched an investigation into whether Summers and other people affiliated with the university broke university policies through their interactions with Epstein and should be subject to disciplinary action.

Many organizations have severed their ties with Summers. Summers’ withdrawal from public commitments include his role as a paid contributor to Bloomberg TV and as a contributing opinion writer at The New York Times. He also withdrew from the Group of 30, an international group of financial and economics experts.

Choice of a wingman was problematic

The correspondence that surfaced in late 2025 indicated that the prominent economist had engaged in more than casual banter with a convicted sex criminal.

Epstein called himself Summers’ “wing man.” Summers asked Epstein about “getting horizontal” with his mentee – a female economist who had studied at Harvard. And, not for the first time, Summers questioned the intelligence of women.

Summers, who is one of the nation’s most influential economists, also complained about the growing intolerance among the “American elite” of sexual misconduct.

These comments call into question Summers’ judgment, behavior and beliefs and the power dynamics between him and the women he has mentored.

As a female economist and a board member of the Committee on the Status of Women in the Economics Profession, I wasn’t surprised by the latest revelations, shocking as they may appear.

After all, it was Summers’ disparaging remarks about what he said was women’s relative inability to do math that led him to relinquish the Harvard presidency in 2006. And researchers have been documenting for years the gender bias that pervades the profession of economics.

A leaky pipeline in higher education

Summers taught my first-year Ph.D. macroeconomics course before he became a prominent policymaker during the Clinton administration, and he advised me during his office hours. Thankfully I did not experience any sexual harassment, but as an economics doctoral candidate at Harvard in the late 1980s, I did gain firsthand insight into the elitist culture of the nation’s top economics program.

Back then, only about 1 in 5 of the people who earned a Ph.D. in economics in the U.S. were women. This percentage rose to 30.5% by 1995 and has barely budged since then.

In 2024, according to the National Science Foundation, 34.2% of newly minted economics Ph.D.s – about 1 in 3 – in the U.S. were women, a considerably lower share than in other social sciences, business, the humanities and science.

After earning doctoral degrees in economics, women face a leaky pipeline in the tenure track, the highest-paid, most secure and prestigious academic jobs. The higher the rank, the lower the representation of women.

In 2024, 34% of assistant professors in economics were women, but only 28% of tenured associate professors – the next step on the ladder – were women. And just 18% of tenured full professors in economics were women.

The gender gap is wider in influential positions, such as economics department chairs and the editorial board members of economics journals. As of 2019, only 24% of the 55,035 editorial board members of economics journals were women. A brief look at the websites of the top 10 economics departments in late 2025 indicates that only one of those 10 department chairs is a woman.

Publication patterns also reflect this inequality. Women are substantially underrepresented as authors in the top economics journals, and this imbalance is not explained by quality differences. Rather, studies have found that women face higher hurdles in peer review, departmental support and finding productive co-authors.

Chilly climate

The data paints a clear picture of systemic bias in the profession’s practices and culture. That bias influences who succeeds and who is sidelined.

A 2019 survey by the American Economic Association, a professional association for economists, documented widespread sexual discrimination and harassment. Almost half of the women surveyed among the association’s members said that they had experienced sexual discrimination that interfered with their careers in some way, and 43% reported having experienced offensive sexual behavior from another economist.

A follow-up survey in 2023 indicated that the association’s new initiatives to improve the professional climate had resulted in little improvement.

Beyond academia

Economists can influence policymakers’ decisions on interest rates, taxation and social spending. In turn, the underrepresentation of women in economics can hamper policymaking by limiting the range of perspectives that inform economic decisions.

Researchers have found that arguments from female economists are roughly 20% more persuasive in shaping public opinion than identical arguments from men.

And yet the gender gap still pervades economics outside academia. At the 12 regional Federal Reserve banks, for example, women constituted just 23% of 411 research track economists in 2022.

Following its own code of conduct

“Economists have a professional obligation to conduct civil and respectful discourse in all forums,” the American Economic Association’s code of conduct states. The code gives organizations in economics a clear basis for deciding whether to keep or cut ties with Summers.

The Committee on the Status of Women in the Economics Profession has called for all economic institutions to undertake investigations into Summers’ conduct.

As of early December, the extent to which economic journals and other economics groups are responding to the controversy was still unclear.

I believe that eliminating inequity in economics would take more than an investigation of Summers’ conduct. In my view, institutions and professional associations, including the American Economic Association, should strengthen and enforce codes of conduct that cover harassment, conflicts of interest and misuse of mentorship roles.

In addition, I think that Summers’ ties to Epstein are a powerful reminder of why university economics departments need clearer standards and more transparency in hiring, promotions and leadership appointments. Strengthening those standards would help them root out the sexism and other forms of elitism that have historically marked the profession so that academic success is driven more by merit than self-perpetuating privilege.

It makes little sense to me that the economics profession is claiming to wield authority while tolerating inequity and ethical lapses. Taking these steps toward greater accountability would help to restore trust.

The Conversation

Yana Rodgers serves on the board of the Committee on the Status of Women in the Economics Profession. Dr. Summers taught her PhD macroeconomics course at Harvard University in 1988.

ref. Larry Summers’ sexism is jeopardizing his power and privilege, but the entire economics profession hinders progress for women – https://theconversation.com/larry-summers-sexism-is-jeopardizing-his-power-and-privilege-but-the-entire-economics-profession-hinders-progress-for-women-270367

Planning life after high school isn’t easy – 4 tips to help students and families navigate the process

Source: The Conversation – USA (2) – By Shannon Pickett, Professor of Psychology and Licensed Mental Health Counselor, Purdue University

While many high school students think mostly about four-year college opportunities, some students might be less certain about what is best. iStock/Getty Images Plus

Many high school seniors are now focusing on what they will do once they graduate – or how they don’t at all know what is to come.

Families trying to guide and support these students at the juncture of a major life transition likely also feel nervous about the open-ended possibilities, from starting at a standard four-year college to not attending college at all.

I am a mental health counselor and psychology professor.

Here are four tips to help make deciding what comes after high school a little easier for everyone involved:

1. Shadow someone with a job you might want

I have worked with many college students who are interested in a particular career path, but are not familiar with the job’s day-to-day workings.

A parent, teacher or another adult in this student’s life could connect them with someone they shadow at work, even for a day, so the student can better understand what the job entails.

High school students may also find that interviewing someone who works in a particular field is another helpful way to narrow down career path options, or finalize their college decisions.

Research published in 2025 shows that high school students who complete an internship are better able to decide whether certain careers are a good fit for them.

2. Look at the numbers

Full-time students can pay anywhere from about US$4,000 for in-state tuition at a public state school per semester to just shy of $50,000 per semester at a private college or university. The average annual cost of tuition alone at a public college or university in 2025 is $10,340, while the average cost of a private school is $39,307.

Tuition continues to rise, though the rate of growth has slowed in the past few years.

About 56% of 2024 college graduates had taken out loans to pay for college.

Concerns about affording college often come up with clients who are deciding on whether or not to get a degree. Research has shown that financial stress and debt load are leading to an increase in students dropping out of college.

It can be helpful for some students to look at tuition costs and project what their monthly student loan payments would be like after graduation, given the expected salary range in particular careers. Financial planning could also help students consider the benefits and drawbacks of public, private, community colleges or vocational schools.

Even with planning, there is no guarantee that students will be able to get a job in their desired field, or quickly earn what they hope to make. No matter how prepared students might be, they should recognize that there are still factors outside their control.

A blue circular maze shows people from above walking on different paths.
No matter what route graduating high school students take, it’s often a stressful period of time.
Klaus Vedfelt/Royalty-Free

3. Normalize other kinds of schools

I have found that some students feel they should go to a four-year college right after they graduate because it is what their families expect. Some students and parents see a four-year college as more prestigious than a two-year program, and believe it is more valuable in terms of long-term career growth.

That isn’t the right fit for everyone, though.

Enrollment at trade-focused schools increased almost 20% from the spring of 2020 through 2025, and now comprises 19.4% of public two-year college enrollment.

Going to a trade school or seeking a two-year associate’s degree can put students on a direct path to get a job in a technical area, such as becoming a registered nurse or electrician.

But there are also reasons for students to think carefully about trade schools.

In some cases, trade schools are for-profit institutions and have been subjected to federal investigation for wrongdoing. Some of these schools have been fined and forced to close.

Still, it is important for students to consider which path is personally best for them.

Research has shown that job satisfaction has a positive impact on mental health, and having a longer history with a career field leads to higher levels of job satisfaction.

4. Consider a gap year before shutting down the idea

One strategy that high school graduates have used in recent years is taking a year off between high school and college in order to better determine what is the right fit for a student. Approximately 2% to 3% of high school graduates take a gap year – typically before going on to enroll in college.

Some young people may travel during a gap year, volunteer, or get a job in their hometown.

Whatever the reason students take gap years, I have seen that the time off can be beneficial in certain situations. Taking a year off before starting college has also been shown to lead to better academic performance in college.

The Conversation

Shannon Pickett 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. Planning life after high school isn’t easy – 4 tips to help students and families navigate the process – https://theconversation.com/planning-life-after-high-school-isnt-easy-4-tips-to-help-students-and-families-navigate-the-process-263864