Sunday, February 16, 2003


Interstellar Give-and-Take: The Idea of Sharing

...Some basic notions of reciprocity seem as familiar to chimpanzees as they do to humans. When Chimp A grooms Chimp B, the giving primate might expect payback at dinner time. And often, the altruistic chimp gets what’s expected. (There are some constraints: chimps seem to forget their past benefactors if more than a couple hours pass between a grooming session and the next meal. For reciprocation, it’s not enough to realize that someone has done you a favor—you also need to remember it.)...