You'd be hard pressed to find two music groups with more divergent sounds than the jam band Phish and the horrorcore rap duo Insane Clown Posse. But they've got something in common. Each of them has a deeply passionate following, and each of them has deeply, deeply passionate haters. When Nathan Rabin tried to write a critic's look at these bands' worlds, he found himself sucked in. Then later Jesse talks to Benjamin Nugent about another group of American sub-culture. D&D players, historical reenactors, ham radio enthusiasts. You know, nerds. Ben is the author of American Nerd: The Story of My People. His 2007 book looks at what the word actually means.