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1932

Disease Update

Photograph of an otter lying on its back. It is playing with two small rocks.
The Mind

The puzzle of play

The purpose of play — for children, monkeys, rats or meerkats — has proved surprisingly hard to pin down. Scientists continue to toss around ideas.

A young black bear cub rests in the embrace of its hibernating mother.
Living World

Bear hibernation: More than a winter’s nap

The creatures’ annual protracted snoozes have much to tell us about the biology of mammals, ourselves included. Now scientists are watching to see how bears will tweak their habits as the climate warms.

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