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Phys.org / Illuminating the limits of the international unit of light, the candela

The candela, the international unit of light in use for almost a century, forms the basis of photometry. According to a new study, measurements derived from it systematically misjudge the brightness of colored light sources ...

Aug 20, 2026
Medical Xpress / Simple mouth rinse may help detect stomach and colorectal cancer signals

It's widely understood that the microbiome—especially microbes found in the mouth and the gut—can have a profound effect on health. In a study published in the journal Cell Host & Microbe on Aug. 20, researchers report that ...

Aug 20, 2026
Phys.org / DNA's physical properties may shape which mutations evolution preserves

Nearly every cell in the human body contains essentially the same genetic information, yet different cells activate different genes. For regulatory proteins to reach these genes, DNA must be accessible. This accessibility ...

Aug 20, 2026
Phys.org / Astronomers catch hot birth of galaxy cluster more than 11 billion light-years away

Astronomers have detected an enormous cloud of gas tens of millions of degrees hot surrounding one of the most extreme structures known in the early universe. The study offers one of the clearest views yet of a galaxy cluster ...

Aug 19, 2026
Phys.org / Turning a quantum battery's environmental sensitivity into an advantage

Quantum batteries, devices that store energy by exploiting quantum mechanical phenomena, could, in principle, be charged faster and more efficiently than classical ones. Despite their potential, connecting these batteries ...

Aug 19, 2026
Phys.org / How sex sheds evolutionary baggage

Why is there sex—or, more precisely, sexual reproduction? If you're an evolutionary biologist, the answer isn't obvious. Sexual reproduction is biologically costly, requiring not only competition for mates but also the creation ...

Aug 20, 2026
Phys.org / Lost 'mega-escarpment' across ancient USA may explain Grand Canyon's missing billion years

Scientists have found evidence that a colossal cliff stretching thousands of kilometers across ancient North America may have exposed the heart of the Grand Canyon nearly a billion years before it was carved by the Colorado ...

Aug 18, 2026
Medical Xpress / Why immune responses to vaccines vary from person to person

Vaccines protect most people from serious illness, but the strength of that protection can vary considerably from one person to another. A new study led by Arizona State University helps us understand why.

Aug 20, 2026
Phys.org / Gentle chemical glow helps scientists capture sharper images of living cells

We reach for brighter, better lighting for sharper pictures, whether we're photographing a puppy or a microscopic cell. In most cases, the light comes from outside the object being photographed. A recent study explored a ...

Aug 19, 2026
Medical Xpress / High-dose vitamin D may improve cognition among those at risk of dementia, study finds

With more than 7 million Americans living with Alzheimer's dementia—a number projected to reach nearly 13 million by 2050—new Emory University research suggests that higher vitamin D supplement intake may be associated with ...

Aug 19, 2026
Medical Xpress / Compound produced after eating pomegranates targets stiff-heart failure pathway, early tests suggest

A compound produced in the body after eating pomegranates improves heart function by up to 80% in a type of heart failure with limited treatment options.

Aug 19, 2026
Phys.org / Tobacco companies helped flood the federal comment process that stalled menthol cigarette ban

When the U.S. Food and Drug Administration (FDA) proposed banning menthol cigarettes and flavored cigars in 2022, nearly 250,000 public comments flooded in—a record response that led the Biden administration to delay a final ...

Aug 20, 2026