No, this book doesn't teach you the science of beating someone up. But it does tell you how to do messy-yet-accurate-enough math in your head, which, in my opinion, is much more beneficial to everyday life and normal people.
The author, Sanjoy Mahajan, teaches tools for quickly coming to an accurate answer, and these tools are to be used whenever you're attacked by a random question, like how many years is a billion seconds. (Answer: about 30 years).
Anyway, you can get a copy of this book for FREE at this website. Isn't Creative Commons great?