It’s a typical workday, and Panbanisha, Kanzi’s younger sister, is sitting before a 42-inch touch-screen display. She’s doing a match-to-sample task: When she presses a green button in the middle of the screen, the computer’s text-to-speech synthesizer says “apple,” and then the lexigram for the word apple appears on screen, along with two other lexigrams, for dog and sorry. Panbanisha touches the one for apple. After five correct responses, she gets to pick a short video to watch. She selects one of her favorites: a clip from Tarzan the Ape Man.