…by Gamow, but that's poor. I mean, it's humorous, but it's poor. He's happy-go-lucky. I don't recommend that. Wait a minute. Leighton, do you know a book on the stuff about general relativity and elementary... Yes, yes, yes, absolutely. Lieber. Oh. It's a…

…in that course, and so I would rather you get the advice from somebody else who knows better what's in it. I don't know. Leighton? What's Math 108 like? This gentleman would like me to answer him whether it's a good idea for a physicist to do it. I…