My mental muscle for math has definitely atrophied since graduating with an engineering degree. I’ve been looking for a nice way to exercise it, and this looks like something that can get me there.

For a more in-depth discussion of physics, I’ve found the Feynman Lectures [1,2] to be quite enjoyable. It’s a long read (I’ve only finished the first book) but it is very thorough.

[1] http://www.feynmanlectures.caltech.edu/ [2] http://www.amazon.com/Feynman-Lectures-Physics-boxed-set/dp/...