I really appreciate this whole series for Andrew and Evan as fun almost-reference-type books. Left-hand side is instructional and humorous (to my 10-year-olds, anyway, with silly senses of humor), and the right-hand side is a fun illustration, which often utilizes some sort of pictorial device for remembering the meaning.
Others in the series include Chemistry, Algebra & Geometry, Physics, Biology, Human Body, etc. Cute--good to have in the car, where they can pick it up, read a few pages, laugh a little, and move on to the next activity.
It's only fair to say that the boys would probably give them 4 stars. :D