I'm suggesting it because, whatever practical tutorials the poster is looking for, the Companion will make for fascinating reading. When I was in school and pl

I'm suggesting it because, whatever practical tutorials the poster is looking for, the Companion will make for fascinating reading. When I was in school and plodding through physics and chemistry class, I was wildly excited by other, more advanced books, which I devoured. Ditto for biology. I wish the Companion was out then, for I would have loved it (although, my love for mathematics wasn't in any way diminished). Sure, the book is not going to teach you K-12 stuff, but it is almost like standing on the edge of mountain, giving you a vista of the wonderful world of math.