Wednesday, April 28, 2010

Unraveling the mystery of the yawn

We do it when we're tired, bored or hungry. Why?

Excerpt:

“We do it when we're tired, when we're bored or when we're hungry; parachutists have been seen to do it before a jump, and research has even suggested a link between yawning and sexual arousal.”

Photo source

No comments:

Post a Comment

Feel free to comment on anything you see and read here. This is an open forum.
Please keep it clean.