And then Nim grows up, and like most grown male chimpanzees, becomes dangerous. By the time he is 5 years old, biting incidents are common, and sometimes brutal. Terrace decides to abort the project; Nim is abruptly torn from his human family and returned to the prison-like research facility where he was born. He has never met another chimpanzee, and doesn’t fare well with the other chimps. However, a pot-smoking Deadhead who works at the facility—Bob Ingersoll, the unlikely hero of the film—befriends him, taking him for walks and playing with him. (“I’d rather be with Nim than Jerry [Garcia],” he says in a present-day interview, “and for me that’s saying something.”) But within a few years, the center loses funding and the chimps, including Nim, are sold to a medical lab that uses them for research into vaccines for diseases like AIDS and Hepatitis B. Happily, Nim’s story doesn’t end there. But neither does it end entirely happily.