Such as the theory that yawning is the body's way of controlling brain temperature. Yeah, apparently scientists think our brains function with all the complexity of an old car engine. And you know how you're always yawning when you wear a hat, right? Right?

The proof of this was experiments in which it was found people with cool packs attached to their heads yawned less. Unless there could be some other reason people sitting in an unfamiliar lab with ice packs on their heads weren't much in a yawning mood...

As for why yawning is contagious, some scientists have pointed to human being's primitive herd instincts, figuring group yawning could have helped regulate sleeping patterns so that a "whoops, we all fell asleep at once and got eaten by giant sloths" situation didn't develop.

This remains merely a theory though, and of course still doesn't explain why people yawn while on their own.

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