A January executive order by President Donald Trump designates people as female if they make the “large” reproductive cell (the egg) and male if they make the ...

A new fossil and DNA analysis traces how dozens of sloth species responded to climate shifts and humans. Just two small tree-dwelling sloths remain today.

The person who received the bladder is doing well, and the successful transplant could offer hope to thousands of people with bladder dysfunction.

Scientists suggest the missile defense plan will face big hurdles, especially given its projected timeline and cost.

Experts explain the science behind Biden's advanced prostate cancer diagnosis, including how common it is and what treatments are available.

Pruney fingertips aren't swollen sponges — the wrinkles actually come from blood vessels constricting and pulling skin inward.

Editor in Chief Nancy Shute discusses the centennial of quantum mechanics’ framework, Hubble’s 35th anniversary and the legacy of Kanzi the bonobo.

Screening for osteoporosis is recommended at age 65, but experts say women should be proactive about bone health long before that.

With greater control over the quantum realm, physicists are poised to make major leaps in quantum computing, quantum gravity and more.

The AI tool used machine learning to outperform current weather simulations, offering faster, cheaper, more accurate forecasts.

You lay a plastic sheet on the mud. Then you lay your body upon the sheet. Without any direct contact between mud and body, you spend several minutes enjoying the soft and saunalike heat, sweating all ...

Not all plants can be stored in a seed bank. Cryopreservation offers an alternative, but critics question whether this form of conservation will work.