You've been told to "let it out" your whole life. But venting anger doesn't release it—it rehearses it. Here's what four ...

We have all been there. You are in a dead-silent room, perhaps during a serious meeting or a solemn ceremony, and suddenly a wave of amusement hits you. You try your absolute best to stay composed, ...

Tiny people giggle at everything from tickling to peek-a-boo to silly faces. But do they really have a sense of humor?