Ha Ha Ha

Whoever said "laughter is the best medicine" was onto something. Laughter is good for the blood vessels, the heart, and the immune system. It can lower blood sugar in diabetics. Laughter can reduce pain. It also works out the muscles of the torso and face. It is estimated that 100 laughs equals 10 minutes on a rowing machine.

Humans are not the only animals that laugh. Chimps, gorillas, orangatans, and bonobos have all been known to laugh. Rats laugh at a pitch higher than the human ear can hear. The hyena is well known for its laughing noises, and it's cousin the dog laughs, too. A dog's laugh sounds a lot like panting.