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.

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 ...

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

Kanzi showed apes have the capacity for language, but in recent years scientists have questioned the ethics of ape experiments.

The new book, Women in the History of Quantum Physics, spotlights the oft-forgotten contributions of women scientists in the field.

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

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

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

Placebo testing has been part of the process since the 1940s. It’s unclear what additional measures would achieve — but it may slow development.

With Joe Biden’s recent diagnosis of an aggressive form of prostate cancer, the former U.S. president joins a growing group of people newly coping with the disease. Biden, 82, represents one of ...

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

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 ...