I just took this common pain medication...and I was today years old when I learned we don't actually know how it works. 😳 ...

Why do we yawn? Most vertebrates, including humans, yawn or exhibit similar behaviors. Spotted hyenas, which live in groups, yawn, as do orangutans, which often live alone. Parrots, penguins, and ...

We have all heard about viral yawning: Someone in the room yawns, and seconds later, half the group is ready to unleash their own. Contagious yawning has always seemed a little silly, a party trick of ...