The fabella disappeared from our lineage millions of years ago, but over the last century, its presence in people’s knees has become more common.

Scott Kelly’s physiology, gene activity, and mental performance changed after time aboard the International Space Station, but mostly returned to normal once back on Earth.

Children born to moms who smoked or ingested marijuana during pregnancy suffer higher rates of depression, hyperactivity, and inattention.

Data gathered from GPS-equipped collars show the animals walk long distances over days without stopping for a drink.

Micrometer-scale fractures in elephant skin results from the way the epidermis grows.

Having pioneered the study of muscle physiology in mammals, she uncovered how ion channels enable muscle movement.

Timekeepers in muscle help mediate metabolism, and may influence neurological processes such as sleep.

Just 20 years ago, scientists didn’t even realize muscles had their own circadian clocks. Now they are beginning to appreciate their importance in health. 

Researchers untangle the multifarious nature of muscle aging. So far, the only reliable treatment is exercise.