Emotions are so interesting.

Terminator: Why do you cry? John Connor: You mean people? Terminator: Yes. John Connor: I don't know. We just cry. You know. When it hurts. Terminator: Pain causes it? John Connor: Uh-uh, no, it's ...

Forbes contributors publish independent expert analyses and insights. I write about relationships, personality, and everyday psychology. Emotional tears are a uniquely human behavior. Research ...