<p> Scientists spent decades watching a large group of chimpanzees in Uganda, living peacefully together. Until 2015, when suddenly things started falling apart. And within a few years, two rival factions were launching violent attacks against one another, resulting in a permanent rift. Aaron Sandel is a primatologist at the University of Texas at Austin, he explains why the violence may have erupted, and what we humans can learn from it, about social breakdown. </p><p><br></p>
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