Innumeracy addresses our mathematical illiteracy that seems not only pervasive, but (as the author notes) a perverse source of pride for many. From giving a sense of scale (a million seconds tick by in about 11 1/2 days, but ticking a billion seconds take 32 years) to revealing common misjudgments and even fears many of us have, Paulos awakens curiosity and self-awareness. The book is mostly examples, readable & interesting. It's an eye-opener.