This is a great book for people who are interested in math, and is essential for math teachers.  It turns the readers attention to real math, but avoids discussing topics like group theory, focusing on a set of problems that are easily understood to interested lay people.<br><br>For instance, I had always known of the 'trick' for calculating pi by throwing needles.  On reading how to do it, it struck me as a potentially fun activity for middle school (or even high school) kids.  The teachers could offer a quick explanation of why it works, and copies of the chapter could be provided for anyone who wanted to know.<br><br>A couple of chapters deal with calculus (though he may never use the word), and any high school teacher who struggles to answer a kid's question about "Why do we need to learn this stuff" will find ample responses.