Oddly enough, if you google for subtraction, Khoi's last name is spelled Vin:
Jonathan says the DMOZ has it spelled incorrectly. Bastards.
Anyway, the book? It's a book for him to review. I saw it, looked through it, and was tickled by it, figuring when he was done reading it and reviewing it, I could also review it. Hot damn, it looks interesting.
So interesting, actually, that I couldn't really wait.
I claimed it.