We all know that for humans, smiling uses fewer muscles than frowning.
Scientists have discovered a similar thing in dogs. It takes fewer muscles to wag their tail than to viciously attacked someone, latch onto their neck and then violently shake and kill them.
One unlucky scientists is currently testing this finding on lions, tigers, pumas, cheetahs, leopards, wildebeest, and Dog the Bounty Hunter.
HELLOOOO NEWMAN: Laughter is your sixth sense
