3.141592657 -- 9 digits, so I couldn't check the box that said I know it to 10.
"You take turns, advise and protect one another, even heal or be healed when the going gets too tough. I know! That's not a game--that's friendship!" ~Shelly Mezzanoble, Confessions of a Part-Time Sorceress: A Girl's Guide to the Dungeons & Dragons Game
