" Cipra has written one of the most entertaining pieces I have read in a long while. Whether you are in the process of learning calculus or teaching it, using calculus regularly or revisiting it, you will find this book a sheer delight. You will also find a lot of good advice about how to tell when your calculations have gone wrong. -Ross L. Finney, coauthor of Calculus and Analytic Geometry, April 2004""... a worthwhile and mind-expanding journey for calculus students."" -Michael Flake, Math Horizons, November 2005"