DS7 brought home this book that his teacher loaned him--now after almost a week of not turning loose of it, he says the teacher told him to keep it. (Must check with teacher to be sure, LOL!) I promise you that it is a must-have for everyone on this board.
It's called Pocket Ref, by Thomas J. Glover, and it is simply a reference guide for everything you can possibly imagine. Weights and measures, military ranks, periodic table of elements, weather map symbols, mileage figuring, you name it and it is in this little book somewhere. Truly a book for the knowledge-obsessed.
I checked and they are on eBay.