““All organisms can make the most basic distinctions--between food and not-food, danger and safety, light and dark, same-species and not-same. But only people can use language to make the highly complex categorizations of, say, animals or physical forces, or however many different kinds of quarks there are now, putting them in separate piles and naming the piles. It's how we proceed; it's how we communicate. Organization into categories is, at bottom, human.””
