As winter swoops over the world, wrapping the days in mist and hardening the ground beneath a layer of frost, people retreat indoors to snuggle into cozy blankets. With heaters humming in the ...

Scientists have uncovered a surprising genetic shift that may explain how animals with backbones—from fish and frogs to humans—became so complex. By comparing sea squirts, lampreys, and frogs, ...

On a winter walk through Alaska’s forests, you might step over what looks like a dead frog, locked stiff beneath the leaves. Its eyes are glazed with ice, its heart doesn’t beat, and its lungs do ...