Why are human brains wrinkled? A study of tiny primates points to how quickly brain-building cells divide—and how much time they have to do this work.

A six-week trial found daily inulin reduced knee pain and improved grip strength, raising questions about how gut microbes influence pain and muscles.

Aging muscles may sacrifice power to protect stressed cells. A study points to a mitochondrial fat—and a surprising downside of blocking that defense.

Brighter daytime light was linked to better long-term brain health in a large study—but researchers cannot yet say whether extra daylight lowers risk.