The story of man's evolution. Is it just a tale of survival for the fittest — the strong eating the weak? Not anymore. Scientists now see that kindness plays a role, along with sympathy, empathy, cooperation and collaboration.

David Brooks, writing in an Op-Ed, entitled Nice Guys Finish First, explained, "We often have an incentive to repay kindness with kindness, so others will do us favors when we're in need."

"Cooperation is as central to evolution as mutation and selection."

(READ the Op-Ed column in NY Times)