Why is math so hard? And why, despite this difficulty, are some people so good at it? If thereâ€™s some inborn capacity for mathematical thinkingÂ—which there must be, otherwise no one could do it Â—why canâ€™t we all do it well? Keith Devlin has answers to all these difficult questions, and in giving them shows us how mathematical ability evolved, why itâ€™s a part of language ability, and how we can make better use of this innate talent.He also offers a breathtakingly new theory of language developmentÂ—that language evolved in two stages, and its main purpose was not communicationÂ—to show that the ability to think mathematically arose out of the same symbol-manipulating ability that was so crucial to the emergence of true language. Why, then, canâ€™t we do math as well as we can speak? The answer, says Devlin, is that we can and doÂ—we just donâ€™t recognize when weâ€™re using mathematical reasoning.