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 ...

Tears are obviously our body’s mechanism to keep our eyeballs well lubricated, but why do humans start bawling when they’re sad, in pain, or overjoyed? What purpose could crying possibly serve? As ...

Do nonhuman animals ever cry from sadness? Tears are useful for our eyes—as they ... Although its exact function is unknown, there are many hypotheses for why we weep. A good cry may help us cope with ...