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Comment by Dr. Krishna Kumari Challa on February 22, 2026 at 8:37am

Pregnancy complications may have helped wipe out Neanderthals

Neanderthals disappeared from the fossil record approximately 40,000 years ago. Their extinction was a gradual process over thousands of years, and theories as to why include competition with modern humans and rapid climate change. However, there may have been other contributory factors: preeclampsia and eclampsia.

A new study published in the Journal of Reproductive Immunology suggests that these potentially life-threatening pregnancy complications may have been more severe in our extinct cousins.

Human fetuses are exceptionally energy-demanding owing to their large brains. To meet this demand, the placenta needs to embed deeply into the mother's uterine wall so that blood can flow freely to the fetus. However, if it does not invade deeply enough or remodel the mother's arteries, blood flow is reduced. It then sheds microscopic debris into the mother's blood, signaling that it is under stress.

The mother's body may react by raising its blood pressure, which can lead to complications, but not always. In many cases, when the placenta fails to invade deeply, the mother does not get preeclampsia. For reasons not yet fully understood, the body ignores the placenta's stress signals, which help protect the mother from developing high blood pressure. The baby may be born small as a result, but the mother stays healthy.

In this new study, an international team of physicians and researchers proposes that Neanderthal women lacked this protective mechanism. Consequently, struggling pregnancies may have triggered life-threatening high blood pressure or seizures, significantly reducing reproductive success.

The scientists based this idea on a comparison between modern medical records and ancient Neanderthal DNA. They identified genetic differences that may have affected how pregnancy-related blood pressure is regulated.
They also suggest that because Neanderthals lived in small, isolated populations, they had very low genetic diversity, so the parents were often genetically very similar. This may have affected how the mother's immune system tolerated the fetus, potentially increasing the risk of pregnancy complications.

The study authors also used modern clinical data to estimate how higher maternal mortality might have affected ancient populations, suggesting it could have contributed to their decline.

Pierre-Yves Robillard et al, Why reproduction has probably been very problematic in Neanderthals: The fabulous history of (pre)eclampsia, Journal of Reproductive Immunology (2026). DOI: 10.1016/j.jri.2026.104852

Comment by Dr. Krishna Kumari Challa on February 22, 2026 at 8:31am

Atom-thin electronics withstand space radiation, potentially surviving for centuries in orbit

Atom-thick layers of molybdenum disulfide are ideally suited for radiation-resistant spacecraft electronics, researchers have confirmed. In a study published in Nature, they put a communications system composed of the material through a gauntlet of rigorous tests—including the transmission of their university's Anthem—confirming that its performance is barely affected in the harsh environment of outer space.

Beyond the protection of Earth's magnetic field, the electronic components of modern spacecraft are extremely vulnerable to constant streams of cosmic rays and heavy ions. While onboard systems can be shielded with radiation-protective materials, this approach takes up valuable space and adds weight to spacecraft. That extra mass drives up launch costs and can limit the payload available for scientific instruments or communications hardware. A far better solution would be to fabricate the electronics themselves from materials that are intrinsically resistant to radiation damage.

One particularly promising route forward involves highly conductive, ultra-thin materials such as molybdenum disulfide (MoS₂). Just a single layer of atoms thick—around 0.7 nanometers—the material has already proven remarkably robust against radiation-induced defects in previous laboratory studies.
In their latest work, the research team subjected the material to its most rigorous test yet. They began by growing monolayer MoS₂ using it to fabricate a transistor-based, radio-frequency communications system. The circuits were then exposed to powerful bursts of gamma rays, delivering doses comparable to those experienced by electronics operating in space.
To assess the effects of this irradiation, the researchers used a suite of cutting-edge imaging and spectroscopy techniques to compare the condition of the MoS₂ before and after exposure.
Transmission electron microscopy provided high-resolution images of the material's cross-section, while energy-dispersive spectroscopy mapping allowed the team to probe any changes in its chemical composition.
After irradiation, Raman spectroscopy measurements at multiple sites across the film were used to examine its structural integrity in detail. Taken together, this exhaustive analysis revealed no clear signs of structural or chemical damage in the atom-thin film.
The team then turned to the circuit's electrical performance. Encouragingly, it remained virtually unchanged after irradiation, with ultra-high on–off ratios and very little current leaking when a voltage was applied. The MoS₂ devices also maintained low power consumption, an important advantage for energy-limited spacecraft.

Liyuan Zhu et al, Radiation-tolerant atomic-layer-scale RF system for spaceborne communication, Nature (2026). DOI: 10.1038/s41586-025-10027-9

Comment by Dr. Krishna Kumari Challa on February 20, 2026 at 1:15pm

A New Light Therapy For Hair Loss

A new form of light therapy can lower markers of hair loss in cell experiments by more than 90 percent.

Scientists in Korea want to use their invention to make a comfortable ‘hair loss’ hat, which can be worn out in public with ease and style.

The light technology is specifically tuned to stimulate hair-regenerating cells at the base of follicles.

Compared with standard red-light treatments, this new tech is 92 percent more effective at reducing a key marker of hair loss.
It also doesn’t have to sit in a hard helmet. The light platform can be slid into a flexible cap that fits closer to the scalp.

With so few effective treatments for hair loss, this new invention is rejuvenating hope for improved hair regrowth.

https://www.nature.com/articles/s41467-025-68258-3

Comment by Dr. Krishna Kumari Challa on February 20, 2026 at 1:12pm

Virus co-opts protein-making equipment

Scientists have identified a giant virus that can hijack a host cell’s protein-making machinery to churn out copies of itself — the first experimental evidence that viruses can co-opt this particular system, which is typically associated with cellular life. To take control, the virus attaches a three-protein complex to the host’s ribosomes — part of the apparatus cells use to make proteins — which gives viral RNA preferential access. Researchers suggest that the virus makes this protein complex using genes that it ‘stole’ from hosts early in its evolutionary history.

https://www.cell.com/cell/fulltext/S0092-8674(26)00055-3?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0092867426000553%3Fshowall%3Dtrue

Comment by Dr. Krishna Kumari Challa on February 20, 2026 at 12:37pm

Scientists discover 'bacterial constipation,' a new disease caused by gut-drying bacteria
Chronic constipation can result from two gut bacteria, Akkermansia muciniphila and Bacteroides thetaiotaomicron, which degrade the protective colonic mucin layer, leading to dry, immobile stool. Elevated levels of these bacteria are found in Parkinson’s disease patients with constipation. Inhibiting bacterial sulfatase activity preserves mucin and may offer a new therapeutic approach.
Scientists have found two gut bacteria working together that contribute to chronic constipation. The duo, Akkermansia muciniphila and Bacteroides thetaiotaomicron, destroy the intestinal mucus coating essential for keeping the colon lubricated and feces hydrated. Their excess degradation leaves patients with dry, immobile stool. This discovery, published in Gut Microbes, finally explains why standard treatments often fail for millions of people with chronic constipation.
Notably, the study shows that Parkinson's disease patients, who suffer from constipation decades before developing tremors, have higher levels of these mucus-degrading bacteria. While constipation in Parkinson's disease has traditionally been attributed to nerve degradation, these findings suggest that bacterial activity also plays a crucial role in the development of their symptoms.

Mucin-degrading intestinal commensal bacteria cause constipation, Gut Microbes (2026). DOI: 10.1080/19490976.2025.2596809

Comment by Dr. Krishna Kumari Challa on February 20, 2026 at 12:33pm

Red blood cells soak up sugar at high altitude, protecting against diabetes

Red blood cells at high altitude absorb increased amounts of glucose under low-oxygen conditions, reducing blood sugar levels and potentially lowering diabetes risk. This adaptation enhances oxygen delivery and persists after returning to normal oxygen levels. A drug mimicking this effect reversed high blood sugar in diabetic mice, suggesting a novel approach for diabetes treatment.

Red Blood Cells Serve as a Primary Glucose Sink to Improve Glucose Tolerance at Altitude, Cell Metabolism (2026). DOI: 10.1016/j.cmet.2026.01.019. www.cell.com/cell-metabolism/f … 1550-4131(26)00018-5

Comment by Dr. Krishna Kumari Challa on February 20, 2026 at 12:25pm

Why some objects in space look like snowmen: Gravitational collapse may shed light on contact binaries

Astronomers have long debated why so many icy objects in the outer solar system look like snowmen.

Researchers now have evidence of the surprisingly simple process that could be responsible for their creation.
Contact binaries—objects in the Kuiper Belt shaped like two connected spheres—form naturally through gravitational collapse. Simulations show that as pebble-sized materials aggregate, binary planetesimals can spiral inward and gently fuse, retaining their shapes. This process accounts for about 10% of Kuiper Belt planetesimals and does not require rare or exotic events.

Far beyond the violent, chaotic asteroid belt between Mars and Jupiter lies what's known as the Kuiper Belt. There, past Neptune, you'll find icy, untouched building blocks from the dawn of the solar system, known as planetesimals. About one in 10 of these objects are contact binaries, planetesimals that are shaped like two connected spheres, much like Frosty the Snowman. 

Researchers created the first simulation that reproduces the two-lobed shape naturally with gravitational collapse. 

Planetesimals are the first large planetary objects to form from the disk of dust and pebbles. Much like individual snowflakes that are packed into a snowball, these first planetesimals are aggregates of pebble-sized objects pulled together by gravity from a cloud of tiny materials.

Occasionally, as the cloud rotates, it falls inward on itself, ripping the object apart and forming two separate planetesimals that orbit one another. Astronomers observe many binary planetesimals in the Kuiper Belt. In this present simulation, the orbits of these objects spiral inward until the two gently make contact and fuse together while still maintaining their round shapes.

How do these two objects stay together throughout the history of the solar system? Because they're simply unlikely to crash into another object. Without a collision, there's nothing to break them apart. Most binaries aren't even pocked with craters.

Direct contact binary planetesimal formation from gravitational collapse, Monthly Notices of the Royal Astronomical Society (2026). DOI: 10.1093/mnras/stag002

Comment by Dr. Krishna Kumari Challa on February 20, 2026 at 12:17pm

Second pregnancy uniquely alters the female brain

Researchers have discovered that a second pregnancy alters the female brain. Previous research from the same group had already demonstrated the impact of a first pregnancy on the female brain. The new results are published in Nature Communications. The research demonstrates that both a first and a second pregnancy have strong and unique impacts on mothers' brains.

A previous study  was the first to show that pregnancy changes the structure of the human brain. The research group also discovered that pregnancy changes brain functioning. For this follow-up study, the researchers tracked 110 women: some became mothers for the first time, others had their second child, and a third group remained childless. Repeated brain scans allowed them to see exactly what changed in the women's brains.

This new work have shown for the first time that the brain not only changes during the first pregnancy, but also during a second. During a first and second pregnancy, the brain changes in both similar and unique ways. Each pregnancy leaves a unique mark on the female brain.

The greatest changes during a first pregnancy occurred in the structure and activity of the so-called default mode net-work. This part of the brain is important for many functions, including self-reflection and social processes. During a second pregnancy, this network changed again, but less strongly. However, during a second pregnancy, there were more changes in brain networks related to directing attention and responding to stimuli.

It appears that during a second pregnancy, the brain is more strongly altered in networks involved in reacting to sensory cues and in controlling your attention.

These processes may be beneficial when caring for multiple children.

The researchers also found a link between changes in the brain and the bond between mother and child. This link was more prominent during a first pregnancy than during a second. In addition, the researchers observed connections between structural brain changes and peripartum depression, both during a first and a second pregnancy, providing the first evidence that the changes taking place in a woman's cortex during pregnancy relate to maternal depression.

For women who became mothers for the first time, this was especially visible after childbirth. For women having their second child, this was particularly the case during their pregnancies.

The effects of a second pregnancy on women's brain structure and function, Nature Communications. DOI: 10.1038/s41467-026-69370-8

Comment by Dr. Krishna Kumari Challa on February 19, 2026 at 10:31am

Heart attack study reveals 'survival paradox'
Analysis of over 900,000 heart attack patients shows that while severe frailty is more common in women, frail men have a higher one-year mortality risk. This "sex-frailty paradox" indicates that frailty impacts outcomes differently by sex, challenging current risk assessments and highlighting the need for sex-specific care pathways and frailty assessment tools in acute myocardial infarction management.

New Research challenges the "one-size-fits-all" approach to heart attack care, adding critical nuance to the debate on sex disparities. A new study involving more than 900,000 patients has revealed a "sex-frailty paradox" in heart attack outcomes, challenging the prevailing narrative that high clinical risk is predominantly a female issue.
While considerable focus has rightly been placed on addressing the fact that women are often undertreated compared to men after a heart attack, this new research, published in The Lancet Regional Health—Europe, highlights a hidden and profound vulnerability in men.
The study found that while severe frailty is indeed more common in women following a heart attack (acute myocardial infarction, or AMI), the actual risk of dying within one year is significantly higher for frail men.

This creates a complex picture where women face inequalities in access to care, but frail men face a "malignant" prognosis that current standard treatments are failing to address.

The study is the largest of its kind, analyzing national data over a 15-year period to disentangle the relationship between sex, frailty, and survival.
It challenges current risk assessments including patient frailty and age used by clinicians to determine treatment strategies, highlighting the need for sex informed care pathways to be included.

Patient frailty has long been an indicator of poorer outcomes, including mortality, rehospitalization and recurrent cardiovascular events, with frailty scores underpinning treatment decisions.

Hasan Mohiaddin et al, Sex–specific associations between frailty and long-term outcomes in patients with acute myocardial infarction: a national population-based study, The Lancet Regional Health - Europe (2026). DOI: 10.1016/j.lanepe.2026.101612

Comment by Dr. Krishna Kumari Challa on February 19, 2026 at 10:28am

Air pollution may directly contribute to Alzheimer's disease—new study
Higher exposure to fine particulate air pollution (PM2.5) is associated with an increased risk of Alzheimer's disease, independent of other risk factors such as high blood pressure, stroke, and depression. PM2.5 particles, primarily from fossil fuel combustion and wildfires, may contribute to brain inflammation and oxidative stress. Global regions with elevated PM2.5 levels face rising dementia rates.

https://journals.plos.org/plosmedicine/article?id=10.1371/journal.p...

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