There's something about this picture that makes me think maybe those funny caveman commericials really aren't that funny. Where do we draw the line between animal and human?

Peter Andrews/Reuters
A volunteer dressed as a cavewoman walks inside a cage at Warsaw Zoo November 26, 2009. According to zoo officials, volunteers have agreed to dress like Neanderthals and spend hours locked up in cages in an effort to educate the public that apes are our close relatives and should be treated with respect.