What separates the human intellect from that of the ape? After you've written your own punch line to that provocative question, have a look at this incredible program from "Nova" and National Geographic. Offering a serious study of animal intelligence, this program reveals that chimps, bonobos, orangutans, and gorillas continue to surprise researchers with mental capabilities that blur the dividing line between man and his closest ancestors. 56 min. Soundtracks: English, DVS.