When writer Jean M. Auel first published her now bestselling novel, “The Clan of the Cave Bear,” back in 1980, she made what seemed a questionable conceit at the center of her story: that our distant ...

More than 50 years ago, Jane Goodall stunned the scientific community by reporting that chimpanzees in Tanzania were using tools, inserting twigs into termite mounds to extract the insects. This ...

Examples for positive, neutral and negative expressions. Copyright held by the authors. Humans perceive emotional expressions displayed by non-human primates and ...