In the 1960s and 70s, a group of chimpanzees astonished the world by learning sign language. Only two remain and one question still lingers—was it worth it?

When people talk to each other, their conversations usually include many fast twists. Humans do not naturally talk in Shakespearean soliloquies, but by regularly interrupting and wildly gesticulating.

If you liked this story, share it with other people. Across human languages and cultures, conversing involves listening to the speaker and rapidly responding to them. This phenomenon, known as ...

New research shows that chimpanzees regularly communicate with each other through rapid back-and-forth gestures, similar to how humans talk. Reading time 2 minutes Chimpanzees and humans are even more ...