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(repeat) Two heads may be better than one.\xa0But what about three or more?\xa0A new study shows that chimpanzees excel at complex tasks when they work in groups, and their accumulated knowledge can even be passed from one generation to the next.\xa0\nBut group-think also can be maladaptive.\xa0When humans rely on knowledge that they assume other people possess, they can become less than rational.\nFind out why one cognitive scientist says that individual thinking is a myth.\xa0Most of your decisions are made in groups, and most derive from emotion, not rationality.\nAlso, why we know far less than we think we do.\xa0For example, most people will say they understand how an everyday object like a zipper works, but draw a blank when asked to explain it.\xa0\nPlus, why we have a biological drive to categorize people as \u201cus\u201d or \u201cthem,\u201d and how we can override it.\xa0\xa0\nGuests:\xa0\n\n\n Steven Sloman\xa0-\xa0Professor of cognitive linguistics and psychological sciences at Brown University and editor-in-chief of the journal,\xa0Cognition\n\n\n\nRobert Sapolsky\xa0- Professor of neuroscience at Stanford University and author of\xa0Behave: The Biology of Humans at Our Best and Worst\n\n\n\nLaurance Doyle\xa0- Scientist at the SETI Institute\n\n\nLearn more about your ad choices. Visit megaphone.fm/adchoices