In the mid-1970s, primatologist Jane Goodall witnessed something that changed her opinion of chimpanzees forever: A four-year conflict amongst the chimpanzees she was studying in Tanzania. Chimpanzees that knew each other started killing each other. It was essentially the primate equivalent of a civil war. And now, it’s happening again: Fighting within the largest known community of chimpanzees. NPR science correspondent Nate Rott helps us break down what’s going on and what it could tell us about how human communities can fall apart. Read all of Nate’s story here. Interested in more science? Email us your question at shortwave@npr.org.Listen to every episode of Short Wave sponsor-free and support our work at NPR by signing up for Short Wave+ at plus.npr.org/shortwave.