Anti-doping agencies are tracking levels of various molecules in athletes’ blood and urine over time to increase their ability to detect drug misuse.

Researchers identify changes to a pain receptor and to an ion channel that appear to enable the rodents to colonize otherwise inhospitable burrows.

A newfound family of metabolites emits green light in response to the blue light of the deep ocean, causing certain sharks to glow.

The goldenrod gall midge, a type of fly, bears larvae that can jump through the air despite their lack of limbs.

The connectomes trace 385 neurons in the male worm and 302 neurons in the hermaphrodite worm.

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.