Tickling is strange because it does not feel optional. You do not decide to laugh. Your body just does it. The sound comes out before your brain has time to judge whether anything is funny. People ...

I don't know why I just thought about this, but there you go. <BR>When you think about it, it's just about the strangest reaction to have to stimulus. I mean, when you get pricked or pound your hand ...

Don’t try this at home, but tickling a gorilla, orangutan, bonobo or chimp can inspire bursts of grunting sounds. Yes, that’s laughter, says Marina Davila Ross of the University of Portsmouth in ...