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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 ...
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.
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 ...
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 ...
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 ...
Phys.org / Rescue mission is called off for NASA's aging Swift space telescope
The mission to save NASA's sinking Swift Observatory was called off Wednesday, dooming the telescope to a fiery reentry later this year.
Phys.org / Snake bones with flint cuts show Mount Carmel settlers ate reptiles 15,000 years ago
Around 15,000 years ago, the way of life of human communities in the southern Levant underwent a fundamental change. Groups of hunter-gatherers, who until then had been nomadic, reduced their mobility and established small, ...
Phys.org / Designing supramolecular therapies to cross the blood-brain barrier
A new Northwestern Medicine study has uncovered key molecular design principles that could help supramolecular therapeutics cross the blood-brain barrier, a major challenge for this novel approach to treating neurological ...
Medical Xpress / Common arthritis pill repurposed to boost hair regrowth in alopecia patients
Upadacitinib is a medication widely used for the treatment of rheumatoid arthritis that works by inhibiting Janus kinase (JAK) enzymes, which are involved in signaling pathways that regulate immune responses. Now, scientists ...
Phys.org / Global sand dunes map reveals clues to distant worlds, including Mars
A new study from Monash University has delivered the most complete and accurate digital map of Earth's windblown sand dunes to date. The research, published in Nature Communications, answers long-standing questions about ...
Phys.org / Layered rock in India shows potential signs of microbial life dating to 3.5 billion years ago
A team of researchers reports that they may have found rock containing some of the earliest forms of microbial life on Earth. Their study, published in the Proceedings of the National Academy of Sciences, describes the biosignatures ...
Phys.org / Clubbing may boost well-being for women in midlife
An online survey published in the journal Psychology of Music asked 136 women ages 40 and older about their experiences at electronic dance music (EDM) events. Nine in 10 respondents (91%) said clubbing contributes positively ...