Altruism has posed a puzzle for psychologists and evolutionary biologists for centuries. Why is it that humans will help others even to their own detriment?
A new study sheds light on the answer to that question by studying the brains of extreme altruistsÂ â people on the extreme end of the caring continuum. In this case researchers chose to study people who donated a kidney to a complete stranger. They found that not only are extreme altruistsâ brains different from a normal personâs, theyâ