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 ...

All humans cry. Some of our tears are meant to keep our eyes moist and healthy. Others clean out the eye from dust, pollens and other pollutants. Emotional tears play another role. Although triggered ...

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. Human infants aren’t able to shed tears for the first few weeks of their lives. Scientists like to show the ...