Most people think that Darwin had this idea of survival of the fittest and that it's really the most ruthless and bloodthirsty who really thrive and survive. That is not Darwin's view of human evolution at all. He really felt that sympathy is the strongest instinct that humans have.
Humans are, at heart, altruistic - or at least we are according to psychology Professor Dacher Keltner, of the University of California at Berkeley who has produced a cheering video to explain why.
"We have learned from neuroscience down at UCLA that if you feel physical pain, a part of your brain lights up and if I see you have physical pain, the same part of my brain lights up," he says. "It's as if we are wired to have the same experience of other people."