In 1960, 26-year-old Jane Goodall traveled to the Gombe Stream National Park in Tanzania and began 55 years of groundbreaking study of chimpanzees. Early on, Goodall debunked two myths: One, that only humans used tools. Two, that chimps were vegetarians. She controversially gave names to the chimps she saw, rather than numbers as was the custom of the day, and she observed traits that were thought to be unique to humans, like affection, joy, and sorrow. Today, Goodall is the world’s leading expert on chimpanzees, and ideas that were considered heresy are now taken for granted as true. As we wish Goodall a happy 85th birthday, take a peek at the 1965 documentary above—it’s pretty darn cool.