Cat Tales

Worshipped as a goddess, condemned as satanic, and spun into a stunning array of breeds, cats have long fascinated humans. But did we ever really domesticate them? And what can science tell us about our most mysterious companions?

It's tough to tell how a cat is feeling just by watching its facial expressions. Can science be used to detect more subtle facial changes that reveal cats' emotions?

Using a training method called "operant conditioning," or clicker training, this traveling troupe of cats have learned an impressive array of tricks.