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Health & Medicine

A chemical imbalance doesn’t explain depression. So what does?

The causes of depression are much more complex than the serotonin hypothesis suggests

Animals

Cockatoos can tell when they need more than one tool to swipe a snack

Cockatoos know when it will take a stick and a straw to nab a nut in a puzzle box. The birds join chimps as the only known nonhumans to use a tool kit.

Paleontology

This dinosaur might have used its feet to snag prey in midair like modern hawks

Fossilized toe pads suggest a hawklike hunting style in Microraptor, a dinosaur that some scientists think could hunt while flying.