Smart Science

A comb with electrified teeth regrew nearly all lost hair on balding skin in a month.

The device, called Detangle, was built by engineers at Beihang University in Beijing and described in Nature Communications. Its teeth carry tiny electrodes set at different heights, plus little pods of medicine, so that each stroke creates an electric field reaching about nine times deeper into the hair follicles than electrodes placed on the skin.

That field gently stimulates the follicles and briefly opens up their cells, letting the comb slip in two treatments: a gene that makes a growth factor called VEGF-A, which builds new blood vessels, and a molecule that silences the enzyme that makes DHT, the hormone that shrinks follicles in pattern baldness.

Mice with this type of hair loss were combed once every three days, and after a month the bald patches regrew nearly 100% of their hair.

Pattern baldness is the most common form of hair loss, and today's options have drawbacks. Pills that block DHT can cause side effects throughout the body, while creams like minoxidil struggle to reach deep enough into the scalp to work well for everyone. A comb that delivers treatment right to the follicle during an ordinary daily habit would sidestep both problems.

That said, every result so far comes from mice whose baldness was induced in the lab, and human scalps and hormones may respond differently.

source: Liu, F., Yao, F., Sun, H., et al. (2026). Combing-triggered electrostimulation synchronizing deep delivery for rapid hair regrowth in androgenetic alopecia. Nature Communications.

What if spacecraft could travel through space without carrying enormous amounts of fuel? An Egyptian physics student once proposed an extraordinary idea that explored whether quantum physics could make this possible.

In 2012, Aisha Mustafa, then a 19-year-old student at Egypt’s Sohag University, attracted international attention for a proposed spacecraft propulsion system based on quantum effects. Her idea involved using the strange behavior of energy in what we normally consider empty space.

According to quantum physics, even a perfect vacuum is not entirely empty. Quantum fields exist throughout space, and their fluctuations can produce measurable physical effects.

One example is the Casimir effect. When two conducting surfaces are placed extremely close together, quantum effects can produce a tiny force between them. Scientists have experimentally measured this phenomenon, making it a genuine and fascinating part of modern physics.

Mustafa proposed using related effects to develop a propulsion system that might reduce or eliminate the need for conventional propellant. Her concept reportedly involved closely spaced plates designed to interact with quantum vacuum fields.

The potential implications were enormous. Conventional rockets accelerate by expelling material in the opposite direction. Carrying propellant adds considerable mass, limiting how far and how efficiently spacecraft can travel.

However, turning quantum vacuum effects into usable spacecraft propulsion presents major scientific challenges. A force between two components of a spacecraft does not automatically produce forward motion, and any proposed system must obey conservation of momentum.

Mustafa’s proposal received international media coverage, but there is no verified evidence that it became a functioning, independently tested propulsion system capable of moving satellites without propellant.

Nevertheless, the underlying research question remains fascinating. Scientists continue investigating advanced propulsion concepts that could make future space exploration more efficient.

Source: The Next Web; Egypt Business; Inhabitat.

About 7% of American adults think chocolate milk actually comes from brown cows.

It’s a reminder that trip to a working farm might teach kids more than any textbooks.

The figure comes from a nationally representative online survey of adults, which was commissioned by the Innovation Center for U.S. Dairy.

Seven percent of the people asked said chocolate milk comes from brown cows, and when The Washington Post scaled that up to the whole adult population, it worked out to roughly 16.4 million people.

For the record, every cow's milk starts out white, whatever color the cow is. Chocolate milk is ordinary milk with cocoa and sugar stirred in.

Funny as it sounds, experts told the Post it fits a much older pattern. A U.S. Department of Agriculture study in the early 1990s found that nearly one in five adults didn't know hamburgers are made from beef, and researchers who interviewed California schoolchildren found many couldn't say that pickles are cucumbers or that cheese is made from milk.

As one food educator put it, "it's an exposure issue," because many people simply never see how their food is produced.

source: The surprising number of American adults who think chocolate milk comes from brown cows. The Washington Post.

🚨 A decade-long study reveals that too much coffee can actually weaken bones.

For millions of women, safeguarding bone health is a critical aspect of aging safely, with osteoporosis affecting one in three women over the age of 50.

Now, a 10-year study conducted by Flinders University has illuminated how our morning rituals impact our skeletal strength.

Researchers tracked the beverage habits and bone scans of nearly 10,000 older women and discovered that regular tea drinkers had significantly higher bone mineral density in their hips than non-tea drinkers. This skeletal boost is likely driven by catechins—antioxidant-rich plant compounds in tea that stimulate bone-building cells and minimize age-related bone loss.

Coffee drinkers, however, must navigate a more delicate balance. While enjoying a moderate two to three cups of coffee daily proved completely harmless, consuming more than five cups a day was linked to decreased bone density, particularly in women with higher lifetime alcohol consumption.

Researchers note that excessive caffeine can hinder calcium absorption, though adding a splash of milk can help offset this effect. Ultimately, health experts suggest that small, daily adjustments—like swapping a heavy coffee habit for a comforting cup of tea—can be an easy, enjoyable strategy to prevent fractures and preserve lifelong mobility.

source: Liu, E., et al. (2025). Longitudinal Association of Coffee and Tea Consumption with Bone Mineral Density in Older Women: A 10-Year Repeated-Measures Analysis in the Study of Osteoporotic Fractures. Nutrients.

Women with higher lifetime estrogen exposure have less damaged blood vessels in their brain, research shows.

The longer a woman's body makes estrogen, the healthier the blood vessels in her brain look in old age, a new study found.

Researchers in Sweden scanned the brains of 352 women from Gothenburg, all born in 1944 and all mentally sharp, first at age 70 and again five years later. They compared those scans with each woman's reproductive history: how long it was from her first period to menopause, and whether she had ever taken the birth control pill or menopausal hormone therapy.

Women with longer reproductive years had fewer signs of small vessel disease, the damage to tiny blood vessels deep in the brain that's tied to strokes and dementia. Each extra year was linked to roughly 8% lower odds of having two or more of those signs, with later menopause doing most of the work.

Women who used hormone therapy also had fewer signs of damage and healthier white matter, and those who had used both the pill and hormone therapy had the best vascular profile of all.

This matters because women make up the majority of people living with Alzheimer's, and scientists are still working out why.

As senior author Anna Marseglia of Karolinska Institutet put it, hormone exposure across different stages of a woman's life may have cumulative effects on the brain's blood vessels.

The work points researchers toward the brain's blood vessels as a promising place to look for ways to protect women's brains as they age.

source: Lorenzon, G., García-Lluch, G., Coughlan, G., Sindi, S., Maioli, S., Poulakis, K., Najar, J., Mohanty, R., Rydén, L., Shams, S., Kern, S., Buckley, R., Westman, E., Skoog, I., & Marseglia, A. (2026). Reproductive lifespan and hormonal therapy in relation to later-life neurovascular health: A population-based study of women in the Gothenburg H70-1944 Birth Cohort. Neurology.