Since Jane Goodall first watched a chimpanzee strip a twig to fish for termites, science has slowly revised its understanding of what separates human culture from animal behavior. Now, researchers in Senegal have documented something that moves the boundary further still: adult chimpanzees deliberately handing tools to their young, not merely tolerating observation, but actively opening the door to knowledge. Recorded across eight years of camera trap footage at Dindefelo, these 33 acts of transfer suggest that teaching — as an intentional investment in another's future competence — may be old