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Health & MedicineA chemical imbalance doesn’t explain depression. So what does?
The causes of depression are much more complex than the serotonin hypothesis suggests
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AnimalsCockatoos 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.
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PaleontologyThis 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.