Emotional tears are a uniquely human behavior. Research suggests they evolved not for eye health but as a powerful social signal that strengthens bonds and elicits care.

Crying also triggers the release of feel-good chemicals, Dr. Parker says, like pain-relieving endorphins and oxytocin (the ...

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 ...