Ten years ago, a young Harvard medical student published a book of short stories that became a national bestseller-it was Ethan Canin, whose collection Emperor of the Air earned him comparisons with writers Philip Roth and Robert Penn Warren. Since then, Canin has taken a leave from his medical career and turned to writing full time. He's now out with his second novel, For Kings and Planets, about two friends attending Columbia University in the seventies. The two are unlikely friends, one is an earnest Midwesterner, the other, a worldly, cynical risk-taker from the East Coast. Canin told Minnesota Public Radio's Tom Crann he's writing novels now instead of short stories because they're better for exploring complicated subjects.