Object Lessons is a series of short, beautifully designed books about the hidden lives of ordinary things. Our ability to make a fist is what distinguishes humans from every other species, including primates. The fist played a crucial role in the birth of language and appears in nearly every form of nonverbal communication, particularly haptics and kinesiology. We use our fist to protest oppression, give pleasure, knock on doors, give daps, and (inaccurately)...