Do you know what one of the secrets to cat happiness is... it is PLAY! (It makes us humans happy, right?).
As a matter of fact, researchers at Stanford University reported there is a part of the human brain that is activated by play. The research was done in humans and not in cats (that's a change!), for any one that has seen a cat play knows that all their senses seem to perk up.
What kind of games do you like to play with your cats?