Learn more about your pupil size in sleep, which reflects whether you’re replaying new or old memories.

From vicious storms and relentless global heating, to volcanic eruptions and shimmering aurora, compelling images help tell ...

Back in the first millennium A.D., waves of human migration across Europe created an elaborate genetic puzzle that ...

Dinosaur fossils have been dug up across the world, but one of the newest discoveries involves a ferocious creature with a ...