The World Until Yesterday - Jared Diamond

For the vast majority that humans have existed, there has been no reason to trust that a stranger you encounter won't kill you. So, the only logical decision would be to try to kill them first. Jared Diamond tells Boyd that strong governments that people believe in have curbed this distrust among neighbors, as has been evidenced in now peaceful tribal societies, like those in Papua New Guinea. But Diamond says that we've learned a lot from recently contacted human civilizations as well. Diamond's new book, The World Until Yesterday, explores tribal societies to learn what lessons we can glean from the humans that we have only recently met.