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Comment by Dr. Krishna Kumari Challa on August 13, 2026 at 9:01am

What made the visible-eyes videos different? To answer that question, researchers used EEG readings. The adult speaker's EEG readings were recorded in advance during video production, while the babies wore EEG caps as they watched the videos. Analyzing brain signals allowed researchers to determine the degree of matching between the adult's and baby's brain activity.

Researchers found that adult-to-infant neural coupling—the one-way matching of adult brain waves to infant brain waves—predicted the infants' ability to learn. Only adult→infant neural coupling, not the infants' own rhythmic brain activity, predicted learning ability.

"The key insight," the authors point out, "is that speaker-to-listener neural coupling is a better predictor of selective learning than infants' own neural activity." Statistical tests supported this: Once researchers accounted for the strength of adult-to-infant coupling, the direct effect of gaze on learning essentially vanished. In short, eye contact drove a brain-to-brain signal that explained the learning boost.

Wei Zhang et al, Adult-to-infant unidirectional neural coupling mediates selective social learning in infants from the United Kingdom and Singapore, Nature Communications (2026). DOI: 10.1038/s41467-026-75831-x

Part 2

Comment by Dr. Krishna Kumari Challa on August 13, 2026 at 9:01am

Eye contact may help babies learn
Have you ever noticed how babies get hooked the moment someone makes eye contact with them? That eye contact is not only cute; it may also send a powerful message to a baby. For years, scientists have been investigating whether social messages like eye contact and baby talk do more than engage babies. They may help synchronize babies' brains with adult brain waves. But the biggest question remained: Does it actually help babies learn?
A new study, published in Nature Communications, offers an answer. Scientists found that 9-month-old infants were able to learn a novel language when the face in a video looked directly at them with fully visible eyes.

Using electroencephalography, or EEG, brain scanning, scientists detected a kind of "neural handshake" between the adult's and infant's brains, synchronized through eye contact.
The results showed how vital eye contact may be for babies' learning. When the person in the video made eye contact while their eyes were fully visible, the infants succeeded in learning the invented language. They recognized which combinations of sounds formed "words" and demonstrated this understanding by spending more time looking at novel sound combinations than ones they had heard before.
The findings provide support for a key assumption of developmental psychology: "Adults curate infants' information selection through ostensive marking of valuable content using social cues such as eye contact." In other words, adults not only provide information for infants but also help them select what to learn.

However, when the speaker's eyes were partly obscured by dark glasses or entirely covered by opaque ones, the babies did not learn. It was as if the switch for learning was off. This was not because they stopped paying attention; the babies looked at the screen for roughly the same amount of time whether the speaker's eyes were visible or not.

Although their eyes were glued to the screen, hiding the speaker's eyes appeared to "scramble" the message, and the participants did not acquire the new language.

The intriguing pattern held for all infants, regardless of whether they were from Singapore or the UK. Babies in both groups were selective learners only when learning from a speaker making visible eye contact.
Part 1

Comment by Dr. Krishna Kumari Challa on August 13, 2026 at 8:40am

Too Cool To Care? Air Conditioning Weakens Climate Action Support: behavioural insulation

Study finds that the more people rely on air conditioning to stay cool, the less likely they are to support broader efforts to cool cities and cut energy use.
As global temperatures rise, air conditioning has become essential to protect people from extreme heat. But a new study has found that widespread reliance on private cooling may be creating a paradox in cities: the more effectively households cool themselves indoors, the less urgency they feel to support the broader climate measures needed to cool cities.
The study has found that households that depend heavily on air conditioning are less likely to adopt energy-saving habits or support community-wide heat mitigation strategies. The findings, published in Sustainable Cities and Society, describe this phenomenon as “behavioural insulation”, where effective indoor cooling dampens the perceived urgency to address heat through collective action.
Heat awareness does not always change behaviour

To explore how people respond to rising temperatures, the researchers analysed survey responses from 967 adults across 416 households in Singapore, together with spatial heat indicators and household electricity consumption records.

The results revealed a clear divide. People who felt more affected by heat were more likely to discuss climate issues and encourage others to act. But this rarely translated into lower household energy use. Those who relied most on air-conditioning tended to consume more electricity and were less likely to adopt energy-saving habits.

One of the key findings is that experiencing heat does not automatically translate into lower-energy behaviour or stronger collective climate action.
The researchers also observed that heavy air-conditioning users showed less support for public heat mitigation measures such as expanding urban greenery, increasing tree cover and improving neighbourhood shading, even while spending more on keeping their own homes cool.
According to the researchers, the findings point to something more systemic than individual indifference — a gradual shift in which widespread private cooling may weaken the behavioural conditions associated with support for collective climate action.
The researchers say they are not arguing against air-conditioning, as cooling is essential for comfort, health and wellbeing. Rather, they argue that cooling should be complemented by urban design strategies which include shading, greening, improved ventilation, reflective building materials and climate-sensitive planning, that reduce outdoor temperatures in the first place.

https://www.sciencedirect.com/science/article/pii/S2210670726003318...

Comment by Dr. Krishna Kumari Challa on August 13, 2026 at 8:31am

Growing rice on the moon

The Moon's surface is a tough place to farm. It has no organic material, and the nitrogen sources that plants need, like ammonia and nitrate, are essentially absent.

Scientists in Japan have created a portable plasma device that can turn air into fertilizer, helping rice grow in simulated lunar soil.

It may sound like science fiction, but a team of researchers from Japan have made it possible to harvest fresh rice on lunar soil. 

The researchers developed a portable plasma device that converts ordinary air into nitrogen fertilizer, When applied to soil designed to simulate the Moon's surface, it neutralized the soil's harsh alkalinity and released trapped nutrients like calcium, magnesium and potassium. This enabled the researchers to grow rice seedlings in the lunar soil.

Beyond its off-world potential, the researchers note that their low-power, fossil-fuel-free technology could help make farming on Earth more sustainable too. 

https://www.nature.com/articles/s41526-026-00602-3

Comment by Dr. Krishna Kumari Challa on August 12, 2026 at 11:17am

Female Brains Wake Up from Anesthesia Differently Than Male Brains
Ketamine anesthesia drives female-specific microglial activity in mice, offering insight about the anesthetic and highlighting the need to study sex as a biological variable.
All over the world, doctors perform more than 300 million surgeries each year. While some procedures require local anesthetics, other ones and people undergoing them go under general anesthesia .
While doctors must ensure that patients go under anesthesia for the procedure, it is equally important that they wake up after the surgery. Researchers have previously found that male and female animals respond differently to the general anesthetic ketamine, but they did not fully understand its underlying molecular basis.
Now, scientists found that sex differences in ketamine recovery arise due to distinct dynamics of neurons and immune cells called microglia in male and female brains. Their findings, published in Science Advances, offer a deeper understanding of ketamine anesthesia recovery and highlight the need to study sex as a biological variable.

https://www.science.org/doi/10.1126/sciadv.adz6517

Comment by Dr. Krishna Kumari Challa on August 12, 2026 at 10:04am

Genome study reveals centromeres as one of the fastest-changing regions in human DNA
A centromere is a specific region on a chromosome that ensures that, when a cell divides, the chromosome separates accurately so each new cell receives the correct amount of genetic material. Despite their essential role, centromeres remain one of the last major blind spots in the human genome.

A recent study published in Nature set out to reveal what had been hidden inside human centromeres, using advanced long-read sequencing and custom-built computational tools to piece together 2,110 complete centromeres. The researchers sampled individuals from 28 population groups across five continents, then compared their centromeres with 5,747 assembled by the Human Pangenome Reference Consortium to trace how these regions differ and evolve.

They discovered 226 major centromere haplotypes—distinct genetic patterns—and 1,870 new genetic variants. By studying a four-generation family, they were able to follow centromeres as they changed from parent to child, tracking genetic changes across generations.
They discovered that centromeres mutated faster than any other part of the human genome, with certain chromosomes accumulating changes at up to 20 times the rate of others.

The kinetochore attachment site, the anchor point where the chromosome attaches to the cell machinery during division, mutated faster than any other part.
The results revealed that centromeres have far more genetic and structural diversity than previously appreciated. When a cell divides, it attaches each chromosome to a protein handle called a kinetochore. For years, scientists assumed there was only one handle per chromosome.

This sequencing found that some centromeres break that rule: Around 6% have two kinetochores, and about 1% have three. Even more importantly, these multi-handled centromeres run in families, passing from parents to children across generations.

While mapping centromeres, the researchers noticed something remarkable: On chromosomes 10 and 21, some people carried centromeres that were separated by more than a million years of evolution from the other modern versions.

Comparing these sequences with ancient genomes indicated that modern humans outside Africa might have inherited these unique centromeres from ancient human relatives through interbreeding with Neanderthals and Denisovans.
Based on the findings, the researchers proposed a kind of evolutionary tug-of-war between centromere DNA and its binding proteins. The anchor point mutates so often that they keep changing both the DNA sequence and the chemical markers that control how it's used, driving rapid evolution in these critical regions of our genome.

Shenghan Gao et al, A global view of human centromere variation and evolution, Nature (2026). DOI: 10.1038/s41586-026-10841-9

Comment by Dr. Krishna Kumari Challa on August 11, 2026 at 9:53am

Why a doctor saying 'it's normal' can backfire

A new study suggests that when physicians try to reassure patients by saying their symptoms are "normal," patients may infer that treatment isn't necessary—and become less inclined to seek it. Doctors may think they're saying "Don't panic." But many patients hear "Don't bother" instead.
Doctors use "normal," it seems, to mean common and well understood. Patients often interpret it as meaning acceptable—or not worth treating.
Published in Nature Human Behaviour, the findings of 14 experiments involving 9,371 participants and a wide range of health conditions, from menopause and migraines to dental pain, seasonal allergies and elevated blood glucose levels.

The findings come amid broader conversations about patients feeling dismissed in health care settings, sometimes described as "medical gaslighting." The study identifies a communication gap that may contribute to those experiences, even when doctors are trying to help.

The good news is that miscommunication isn't inevitable. The researchers also tested two simple ways to reduce it: pairing normalizing language with an explicit recommendation for treatment and explaining that "normal" was meant in a statistical, not normative or prescriptive, sense.

Both approaches helped close the communication gap.
The key takeaway for patients: If you're unsure what your doctor means when they say a symptom is "normal," don't assume it means treatment isn't recommended and you should just live with it. Ask.

Common symptoms can still deserve attention—and treatment.

Seyi Lawal et al, Reassurance through normalization inadvertently suppresses treatment, Nature Human Behaviour (2026). DOI: 10.1038/s41562-026-02542-0

Comment by Dr. Krishna Kumari Challa on August 11, 2026 at 9:44am

One million years without sex fails to erase stick insects' unused biological system
In Timema stick insects reproducing asexually for ~1 million years, X-chromosome dosage compensation remains functional in rare males. Its persistence despite prolonged absence of sexual reproduction indicates that sex-chromosome regulatory mechanisms may not rapidly decay after their original selective role is removed.

Darren J. Parker et al, Dosage compensation and meiotic sex chromosome inactivation are maintained under relaxed selection, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2531501123

Comment by Dr. Krishna Kumari Challa on August 11, 2026 at 9:37am

Most people are unaware of the environmental effects of sunscreen

UV filter compounds enter the marine environment directly or indirectly. Direct pathways include swimming or other water-based recreational activities, and indirect pathways include washing towels that have been used to dry sunscreen-coated skin, washing off residue during showering and even in urine.

Traditional sewage and water treatment technologies cannot effectively remove most UV filters, and organic UV filters have been reported in 95% of wastewater effluents and 86% of surface waters globally. They have also been detected in marine environments worldwide, from busy tourist locations to remote areas such as Antarctica and the Arctic, highlighting the extent of this contamination.

UV filter pollution has also been linked with agricultural practices, where recycled wastewater and sludge biosolids used as fertilizers can transfer UV filters onto crops and into runoff that eventually reaches rivers and coastal waters.

New research has revealed a striking gap in awareness about the environmental impacts of sunscreen, with more than half of people never having considered that the products they use to protect their skin from the sun's rays could be harmful once they enter the ocean.
That is despite extensive scientific evidence showing that sunscreen ingredients—particularly ultraviolet (UV) filters—can pose a number of risks to marine organisms, including fish, algae and coral reefs.

The research also showed that more than 8 out of 10 people were unaware of the existence of reef-safe sunscreen, an unregulated marketing term often used by brands to imply reduced harm to marine life, despite this not always being the case. This inconsistency is another issue explored within the study.
The researchers say their findings highlight a clear gap between scientific evidence and public awareness and have direct implications for future marine policy and regulation, product labeling and consumer guidance.

That, they add, is because public opinions are essential in encouraging manufacturers to develop choices that balance human and environmental safety.
A key piece of data is that 55% of participants had never considered that sunscreen may be harmful to the marine environment. This demonstrates just how vital clear and accessible communication is in bridging the gap between research and public awareness.
In the study, 281 participants voluntarily responded to a set of five questions on the topic, and 89% reported using sunscreen at some point within the year. However, 81% were unfamiliar with the term reef-safe, and 55% had never considered sunscreens harmful to the marine environment.
The researchers say these findings emphasize the need for clear public messaging and more transparent and regulated product information.

Anneliese A. Hodge et al, User habits and public perceptions of sunscreen pollution: A global review and case study of Britain's Ocean City, Marine Policy (2026). DOI: 10.1016/j.marpol.2026.107244

Comment by Dr. Krishna Kumari Challa on August 11, 2026 at 9:24am

The researchers then tested the effect in mice by disabling the FNIP1 pathway in the liver. Even when fed a high-fat, high-sugar junk-food diet for up to 30 weeks, these mice were strongly protected against weight gain and fat buildup in the liver.

The results identify FNIP1 as a key player in how the human body manages energy and metabolic biomarkers. Researchers are hopeful that blocking it therapeutically could eventually be used to tackle heart disease, obesity and diabetes.

George Hindy et al, FNIP1 variants are associated with favourable metabolism in 1 million humans, Nature (2026). DOI: 10.1038/s41586-026-10864-2

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