If you ever found yourself digging through a college textbook looking for something that you forgot or wanted to get an idea just right in your understanding, then you will love this book for its laser-like focus on several equations that are critical to the history of physics. There are many here who come from technical backgrounds who have already reviewed this wonderful short book. I can add nothing to that technical perspective. What I can add is that if you started your working life with physics in high school, and math through calculus, maybe differential equations in college, you are more than ready for this book. It will make you happy to realize that someone has plucked this important contribution by James Clerk Maxwell out of the maze of information in a modern physics book at the library. It is a bit more than a cheat sheet and a whole lot less than Halliday, Resnick and Walker Fundamentals of Physics.