Tickling rats. It sounds like a euphemism for something not quite acceptable for print but is, in fact, science. While it may not be the most technologically innovative method of research, scientists ...

A new study is linking brain behavior to silly playtime practices. And they have lab rats laughing out loud to prove it.In the video above, you can hear tiny high-pitched giggles from a rat being ...

March 31, 2005 — -- We may know what kinds of things make us laugh -- slapstick, a clever pun, an inside joke with an old friend, an April Fools' gag -- but just what are those strange sounds we ...