<http://schema.org/about>
"For a long time altruistic behavior in chimpanzees in the wild has been documented--unrelated chimps helping one another without apparent expectation of reward--but documentation in a more controlled environment had been lacking,"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/natural-sciences/altruistic-chimpanzees-documented-for-first-time-in-captivity.html>