In a new study of chimpanzees (Pan troglodytes) and bonobos (Pan paniscus), scientists found that embraces, touches and other reassuring gestures before competition for food were linked to more peaceful sharing, suggesting the roots of human social touch stretch back at least six million years. Examples of bonobo and chimpanzee reassurance behaviors. Image credit: Z. Clay / J.S. Brooker. “Social tolerance, broadly defined as the tendency of conspecifics...
