I've often wanted to understand how mathematics has been used to define laws that are proven, or not, by experiment.<br><br>I can understand how experiment can find the mass of an electron, for example. But how can a series of equations predict the mass?<br><br>This book provides just such insight without a lot of heavy mathematics. You should brush up on basics of motion and the calculus of derivatives to make the most of the book, but it's really not required.