Research suggests that crying is not a sign of weakness, but one of the most sophisticated social technologies in the natural world.

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 usually seen as a sign of sadness or pain, but it’s not uncommon for people to cry during life’s most joyful moments: weddings, births, reunions, sporting triumphs, or even just an ...

We’re the only species that sheds emotional tears, but much about them remains an enigma. Credit... Supported by By Dana G. Smith Illustrations by Dominic Kesterton The last thing that made Dana Smith ...