Chimpanzees are humanity's closest living relative, but there's both wonder and existential horror in that closeness. A species barrier separates us from the rest of the animal kingdom, but what if a chimp/human hybrid were to bridge that barrier? Join Robert Lamb and Christian Sager as they explore the case history of Russian biologist Ilya Ivanovich Ivanov and his attempts to breed a human/chimp hybrid in the early 20th century. (Originally published Jan. 21, 2016)