You know the feeling. It’s getting close to bedtime, you get sleepy, and you start yawning automatically. You may even find ...

Humans aren't alone when it comes to yawning — all vertebrates do it too, including fish, amphibians, reptiles, birds and mammals. But why? The "evolutionarily ancient" act of yawning likely ...

A study in Japan suggests that peeing is contagious in chimpanzee troops. When one goes, they all tend to go. The question is why. The finding is based on more than 600 hours of chimp ...

The average adult yawns about 20 times a day. But why? Surely we cannot all be that tired. The truth is the science behind yawning is much more complex than just a few hours too little sleep.