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Category: health

Study of 65,000 college students links 16 hours a week on social media to higher loneliness

More than half of college students are lonely—and those who use social media the most are particularly likely to feel isolated, a study of tens of thousands of 18 to 24-year-olds in the US shows. Just 16 hours a week—two or so hours a day—on social media was linked with higher odds of loneliness, reports a paper in the Journal of American College Health.

The study’s authors said that academic institutions should educate students on the effects of social media use and encourage them to set time limits.

Researcher Dr. Madelyn Hill, now an assistant professor at Ohio University, who led the study while completing her doctoral work in University of Cincinnati’s School of Human Services in spring 2025, explains, We know that people who are lonely are more likely to become depressed. We also know that those who are lonely are more likely to die early.

New sound-based 3D-printing method enables finer, faster microdevices

Concordia researchers have developed a new 3D-printing technique that uses sound waves to directly print tiny structures onto soft polymers like silicone with far greater precision than before. The approach, called proximal sound printing, opens new possibilities for manufacturing microscale devices used in health care, environmental monitoring and advanced sensors. It is described in the journal Microsystems & Nanoengineering.

The technique relies on focused ultrasound to trigger chemical reactions that solidify liquid polymers exactly where printing is needed. Unlike conventional methods that rely on heat or light, sound-based 3D-printing works with key materials used in microfluidic devices, lab-on-a-chip systems and soft electronics that are hard to print at small scales.

This work builds on the research team’s earlier breakthrough in direct sound printing, which first showed that ultrasound could be used to cure polymers on demand. While that earlier method demonstrated the concept, it struggled with limited resolution and consistency. The new proximal approach places the sound source much closer to the printing surface, allowing far tighter control.

Why Mucus and Phlegm Matter in Health and Disease

It’s mucus season—the time of year this sticky goo makes an appearance in the form of runny noses and phlegmy coughs. While most people are only aware of mucus when they are sick, their organs are blanketed with the stuff year-round. And, when it comes to the microbes living in our bodies, mucus is incredibly important. It provides a spatial and nutritional niche for diverse organisms to thrive, while also preventing them from getting too close to host tissues. Mucus also regulates microbial growth, metabolism and virulence, ultimately controlling the composition of microbial communities throughout the body. As such, scientists are looking at how to exploit mucus-microbe interactions to foster human health.

Mucus is found in creatures spanning the tree of life, from corals to people. In humans and other mammals, the slick goop coats epithelial tissues, including those in the mouth, lungs, gut and urogenital tract. In these regions, mucus protects cells from physical and enzymatic stress, heals wounds and selectively filters particles that can pass through to underlying tissues.

Smartwatch and Hypertension Notification

From JAMA: The US Food and Drug Administration recently cleared the Apple Watch hypertension notification feature.

Researchers applied performance metrics reported by Apple to nationally representative survey data and found that, overall, 69% of individuals who receive a smartwatch alert would have hypertension, while 79% of those who do not receive an alert would not have hypertension. However, these rates vary according to subgroup characteristics, such as age and sex.

Current guidelines recommend cuff-based blood pressure measurement as the standard for diagnosing hypertension. Incorporating cuffless device technologies into public health screening efforts will require additional validation and careful attention to device accuracy to reduce misclassification and the risk of false reassurance.

This cross-sectional study assesses the potential impact of a smartwatch hypertension notification feature for US adults who have not been diagnosed with hypertension.

Blood-based tests show strong promise for dementia diagnosis—but population diversity matters

In a study published today, Friday, February 13, 2026, in the journal Nature Aging, researchers show that blood-based biomarkers can support accurate dementia diagnosis across diverse populations when integrated with cognitive and neuroimaging measures. Blood-based biomarkers are emerging as one of the most promising advances for the global diagnosis of dementia, including Alzheimer’s disease and frontotemporal lobar degeneration. These tests offer a more accessible, scalable, and cost-effective alternative to traditional diagnostic tools such as brain imaging or cerebrospinal fluid analysis.

However, most blood-based biomarkers have been developed and validated primarily in relatively homogeneous populations. Genetic background, overall physical health, and environmental and social exposures can substantially influence biomarker levels, raising concerns about how well these tests perform across diverse populations worldwide.

Dario Amodei — “We are near the end of the exponential”

Predicts significant advancements in AI capabilities within the next decade, which will have a profound impact on society, economy, and individuals, and emphasizes the need for careful governance, equitable distribution of benefits, and responsible development to mitigate risks and maximize benefits ## ## Questions to inspire discussion.

AI Scaling and Progress.

Q: What are the key factors driving AI progress according to the scaling hypothesis?

A: Compute, data quantity and quality, training duration, and objective functions that can scale massively drive AI progress, per Dario Amodei’s “Big Blob of Compute Hypothesis” from 2017.

Q: Why do AI models trained on broad data distributions perform better?

A: Models like GPT-2 generalize better when trained on wide variety of internet text rather than narrow datasets like fanfiction, leading to superior performance on diverse tasks.

Continue reading “Dario Amodei — “We are near the end of the exponential”” | >

Scientists Just Uncovered How Menopause Rewires the Brain

Menopause reshapes the brain in surprising ways — but it may also reveal the brain’s remarkable ability to adapt.

During menopause, many women notice episodes of “brain fog,” which can include forgetfulness, difficulty focusing, and persistent mental tiredness. These challenges are often linked to shifting hormone levels. To better understand what is happening in the brain during this life stage, researchers reviewed previously published studies examining how structural brain changes relate to cognitive, emotional, and physical health outcomes. Their findings were presented at the 2025 Annual Meeting of The Menopause Society.

Structural Brain Changes During Menopause.

Technical advance ✨

Laszlo Nagy & team define unique regulatory programs of placental Hofbauer cells, advancing understanding of their role in pregnancy health and potential disease:

The image shows enrichment of Hofbauer cells by CD163-based cell sorting Placenta Fetal Development.

1Department of Biochemistry and Molecular Biology, Faculty of Medicine, and.

2Doctoral School of Molecular Cell and Immune Biology, University of Debrecen, Debrecen, Hungary.

3Institute for Fundamental Biomedical Research, Johns Hopkins All Children’s Hospital, St. Petersburg, Florida, USA.

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