Adult/High School—This collection of essays is a good choice for teens who suspect what geeks already know—that mathematics is interesting and, yes, even fun. The selections are geek lite, covering such questions as "How heavy is your house?" and "Which is more powerful—your brain or a PC?" The answers provided are short (typically four to eight pages); humorous; and, best of all for the mathematically challenged, easy to understand. Tattersall occasionally throws in an impressive-looking formula in a display of "gee-whiz" showmanship, but readers need not worry.