Cooperation in animals has long been a major focus in evolutionary biology. In particular, reciprocal altruism, where helpful acts are contingent upon the likelihood of getting help in return, is ...

Empirical evidence from rats supports the theory of generalized reciprocity, in which individuals are more likely to cooperate with an unknown individual if they have received help in the past.

SALT LAKE CITY, June 15, 2016 - It's easy to understand why natural selection favors people who help close kin at their own expense: It can increase the odds the family's genes are passed to future ...

Every worker in a company is going to have their own objectives for their role, personal goals that they hope to reach, and an agenda they have set for themselves on how they will accomplish both. It ...

TimesMachine is an exclusive benefit for home delivery and digital subscribers. About the Archive This is a digitized version of an article from The Times’s print archive, before the start of online ...

Natural selection favors people who help close kin at their own expense: It can increase the odds the family’s genes are passed to future generations. But why assist distant relatives? Mathematical ...