I was originally the type of person who would "sleep flat on my back without moving a muscle." I probably have a deep sleep, ...

In a reward-free touchscreen game, Japanese macaques favored a button that made a puppet pop up in somewhat unpredictable spots, like curious humans. Six zoo orangutans heard laughter before learning ...

In the middle of the night, a sudden, sharp pain shoots through your calf.You involuntarily cry out and jump out of bed.Even ...