Science Simplified!

Comment

Comment by Dr. Krishna Kumari Challa on June 18, 2026 at 12:04pm

Antisocial behaviour in young people linked to changes throughout the brain

Conduct problems—including persistent rule-breaking, aggression, irritability and difficulty following school rules—are associated with small but widespread differences in brain structure, according to a major international study of more than 14,000 children and adolescents.
Conduct problems in 14,000 youths aged 5–21 were associated with small but widespread reductions in cortical thickness, cortical surface area, and subcortical volumes, scaling with symptom severity and present across the full spectrum, not only in diagnosed conduct disorder. Effects were modest, influenced by environmental factors, and support dimensional rather than categorical views of behavioural disorders.
Importantly, these brain changes were found not to be limited to young people with a formal diagnosis of conduct disorder—a mental health condition in children and adolescents characterized by persistent patterns of antisocial behavior. Instead, they were present across the full range of severity, including in youngsters with mild behavioral difficulties.

The study's authors say this research marks an important step forward in understanding the biological and developmental roots of conduct problems, with the potential to inform more effective, tailored interventions for young people worldwide.
According to the team's findings, the more serious a young person's conduct problems, the more pronounced the differences in brain structure. The researchers found this to be true for the thickness of the cortex (the outer layer of the brain), the surface area of the cortex, and the size of key subcortical regions—areas found deeper in the brain.

Marlene Staginnus et al, Dimensional Associations Between Conduct Problems and Brain Structure Across 18 International Cohorts in ENIGMA, Journal of the American Academy of Child & Adolescent Psychiatry (2026). DOI: 10.1016/j.jaac.2026.03.002

Comment by Dr. Krishna Kumari Challa on June 18, 2026 at 11:23am

Everyday chemical exposures linked to preterm birth and lower birthweight
In one of the largest studies of chemical exposures during pregnancy to date, new research has found that pregnant women are exposed to dozens of everyday chemicals, many of which can affect how early a child is born or a child's weight at birth. These outcomes influence a child's health throughout life.

A cohort of >5,000 mother–child pairs showed maternal exposure to a mean of 45 everyday chemicals, including phthalates, replacement plasticizers, PAHs and halogenated phenols. Higher levels of several phthalates, alternative plasticizers and PAHs were associated with shorter gestation and lower birthweight, and newer replacement plasticizers exhibited similar adverse associations.
The research, published in JAMA Network Open, found that pregnant women in the study were exposed to an average of 45 different chemicals, including phthalates, replacement plasticizers, polycyclic aromatic hydrocarbons (PAHs) and halogenated phenols. These chemicals are found in food, water, air pollution, personal care products, fragrances and other household objects.

These chemicals are difficult to avoid because they're found in a wide range of products we use every day. It can be difficult to know whether products contain them, and even when we do know, we have limited control over exposures.
Although there are some practical steps people can take, reducing harmful chemicals at the source is the most effective way to protect children and families.

Phthalates and replacement plasticizers, in particular, are found in many baby care products, such as toys, diaper creams and shampoos. The new study found several additional phthalates, including those that replaced banned phthalates, and plasticizer chemicals in women's samples.
The study included more than 5,000 pairs of mothers and children born between 2000 and 2021 and collected data on chemicals found in maternal urine samples, pregnancy duration and birth weight. Researchers tested for 113 different chemicals commonly found in homes and in air, food and water and found that, on average, 45 were present in each sample (the maximum they observed in a sample was 64). The team then examined how differences in gestational age and birth weight were linked to these chemical exposures.

Several phthalates and alternative plasticizers showed a consistent association with earlier delivery. Phthalates, replacement plasticizers and PAHs were also linked to lower birth weight. Some less-studied chemicals that the researchers identified, including halogenated phenols, were also associated with lower birth weight. The researchers also identified plasticizers recently introduced to replace toxic chemicals like phthalates. However, these newer substances had similar health effects to the chemicals they replaced.

Gestational exposure to ten classes of priority chemicals and birth outcomes in the ECHO Cohort, JAMA Network Open (2026). DOI: 10.1001/jamanetworkopen.2026.18883

Comment by Dr. Krishna Kumari Challa on June 18, 2026 at 11:11am

Levels of 'forever chemicals' in dolphins and whales are rising globally
PFAS concentrations in cetaceans have increased globally since 2000, with highest levels in Pacific populations and coastal dolphins and porpoises. Contamination varies by species, region, sex, and age, with maternal transfer exposing calves early and males accumulating higher burdens. Data gaps remain for several regions. Findings support stricter PFAS controls and continued biomonitoring.

https://www.sciencedirect.com/science/article/pii/S0025326X26007368...

original article.

Comment by Dr. Krishna Kumari Challa on June 18, 2026 at 11:00am

Genetic study finds urban rodents may be evolving against common poisons

For years, pest control professionals throughout the Northeast have reported a troubling pattern. In some neighbourhoods, rodents seemed increasingly difficult to eliminate, even when standard control methods were used. Now researchers think they may know one reason why.
A study found that 84% of house mice sampled from urban areas in the Northeast carried at least one genetic mutation linked to rodenticide resistance, suggesting many mouse populations may be evolving ways to survive the poisons commonly used to control them.

Urban house mice in northeastern U.S. cities show high frequencies of Vkorc1 mutations linked to anticoagulant rodenticide resistance, with 84% carrying at least one mutation and ~70% carrying known resistance alleles. About 35% of Norway rats carry Vkorc1 variants of uncertain functional impact. Findings indicate widespread, evolving resistance and support integrated, less chemical‑reliant rodent management.

Jin‐Jia Yu et al, Distribution and frequency of Vkorc1 polymorphisms in house mice and Norway rats in the northeastern United States, Pest Management Science (2026). DOI: 10.1002/ps.70833

Comment by Dr. Krishna Kumari Challa on June 18, 2026 at 10:54am

Evolution can make cells smaller without slowing down their growth

A new study shows that evolution can substantially reduce cell size without significantly compromising cells' ability to grow.
"Why are cells the size they are?" The question may seem simple, but cell size influences fundamental processes, including metabolism, growth and cell division. Despite the enormous diversity of shapes and sizes found in nature, each cell type tends to remain within a relatively narrow size range. When a cell becomes too large or too small, its function can be compromised.

Previous studies have shown that each cell type tends to have a characteristic size, and that this size is important for its function. When we make cells larger or smaller, they start to perform worse.
The question driving this study was how, over the course of evolution, cells of such different sizes could arise if even small changes to a cell's normal size can come with biological costs.

To address this question, the researchers used experimental evolution. Over approximately 1,500 generations, they selected the smallest yeast cells in each population every day. But these cells also had to compete for nutrients and multiply quickly before the next round of selection.

Experimental evolution in yeast over ~1,500 generations produced substantially smaller cells without major loss of growth rate by selecting simultaneously for reduced size and rapid proliferation. Genome sequencing revealed mutations in conserved growth and cell-cycle pathways that causally reduced size, indicating that evolution can partially uncouple cell miniaturization from growth capacity.
The results of this study suggest that evolution can gradually fine-tune fundamental cellular mechanisms to alter cell size, partially uncoupling two traits that appeared to be inevitably linked: miniaturization and growth capacity.

Ana Garoña et al, Experimental evolution of cellular miniaturization reveals a putative mechanism for cell size evolution, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2531280123

Comment by Dr. Krishna Kumari Challa on June 18, 2026 at 10:41am

Why just sharing a stick while walking can significantly improve balance
Could the secret to preventing dangerous falls be surprisingly simple? For older adults, these unexpected tumbles are a leading cause of injury, affecting roughly 1 in 4 people 65 and older each year. What if the key isn't complex technology or intensive therapy, but something as straightforward as a shared connection? Forget holding hands—new research reveals a surprising twist in how two people can become a dynamic duo against sudden loss of balance.
A rigid mechanical link between two side-by-side walkers improves post-perturbation stability and speeds balance recovery compared with no link or an elastic connection. Benefits are greatest when only one partner is perturbed, with the unperturbed individual acting as a stabilizing anchor. High-frequency (~15 Hz) tactile interactions mediate rapid corrective forces, suggesting a fast sensorimotor communication channel through touch.

A recent study, published in the Journal of the Royal Society Interface, demonstrates that when two individuals walk side by side, a rigid link between them dramatically accelerates balance recovery after unexpected slips.

Scientists put this to the test with 12 pairs of volunteers on a specialized treadmill, finding that a simple stick, unlike an elastic band or no connection at all, transforms walkers into a rapid-response team, significantly improving stability and speeding recovery from perturbations.
The results demonstrated an improvement in stability when an interaction was present, particularly in the case of a slip perturbation," the researchers note. The unperturbed walker essentially became an effective stabilizer.

Sandrine Gayrard et al, Instability analysis of perturbed gait in dyads: holding a stick together provides effective assistance and is accompanied by information exchanges, Journal of the Royal Society Interface (2026). DOI: 10.1098/rsif.2026.0206

Comment by Dr. Krishna Kumari Challa on June 17, 2026 at 12:13pm

How many elementary particles are there?
Even if you know your fermions from your bosons, the actual number of fundamental particles — the electrons, quarks and other building blocks of physics — is still uncertain. From the 17 that feature on posters on classroom walls, “where you stop depends on your taste for complexity and mystery”, explains science writer Natalie Wolchover. “Plausible answers range from 17 to — in all seriousness — 995.5.”

https://www.quantamagazine.org/how-many-elementary-particles-are-th...

Comment by Dr. Krishna Kumari Challa on June 17, 2026 at 11:56am

Psychologists say patients are turning to chatbots as mental health professionals

More than three-quarters of psychologists report their patients are discussing artificial intelligence in therapy, using the technology to seek additional support with their mental health, find a diagnosis, or for friendship and intimate relationships, according to a survey
Most psychologists report patients use AI chatbots to supplement therapy for self-diagnosis, coping support, and companionship, often feeling validated but sometimes developing dependency or distorted thinking. Clinicians express substantial concern about chatbots’ limited nuance, risk of reinforcing negative beliefs, and potential to encourage self-harm. AI is viewed as a possible adjunct when professionals are unavailable, not a replacement for human care.

AI should always be used carefully. Developed with guidance from an advisory panel of experts in digital mental health, clinical psychology, and youth and adolescent well-being, APA's recommendations for users include:

Verifying any mental health or medical information generated by AI with a health care practitioner.
Asking for strategies aligned with research-backed therapeutic approaches.
Prompting AI to challenge your thinking or provide alternative perspectives.
Limiting your use of AI so it does not interfere with sleep, hobbies, school, work or social interaction.

https://www.apa.org/pubs/reports/chatbots-mental-health-2026

Comment by Dr. Krishna Kumari Challa on June 17, 2026 at 11:50am

Seeking health information does not automatically improve health behavior, says researcher

People are increasingly seeking health information online , but the information they find is not leading to better health decisions. The concern is not a lack of information but people's digital literacy and ability to make sense of it.
Among people aged ≥50, online health information seeking is shaped by education, digital skills, and internet habits, and does not automatically translate into healthier behaviour. Physicians remain the primary trusted source, while many struggle to assess online information reliability. Unequal digital literacy can widen health inequalities, indicating a need to strengthen critical digital and health literacy rather than only expanding digital services.

Marianne Paimre, Patterns of Online Health Information-Seeking Behaviour and Related Factors Among Estonian Older Adults, Tallinn University (2026). DOI: 10.60518/etera/150

Comment by Dr. Krishna Kumari Challa on June 17, 2026 at 11:44am

Many cancers originate from a single cancer cell and evolve through early bursts of chromosome changes
Tumors across multiple cancer types arise from a single ancestral cell that acquires early shared copy number alterations, followed by punctuated bursts of additional chromosomal changes generating diverse subclones. High aneuploidy, TP53 mutations, genome doubling, and elevated CNA burden correlate with greater intratumoral diversity, spatial heterogeneity, advanced stage, and poorer outcomes.

Hanghui Ye et al, A pan-cancer single-cell analysis of intratumoral copy number diversity and evolution, Cancer Discovery (2026). DOI: 10.1158/2159-8290.cd-25-0964

• ‹ Previous
• 1
• …
• 4
• 5
• 6
• 7
• 8
• …
• 1258
• Next ›
• Page