I like Ken Jennings. Although likes to tell you he is a genius, which is annoying, since he really is, it isn't as annoying.
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I saw a review of this a few days ago; seems one guy found a big error, he said, on page 3, where Jennings said some town was split between AL and LA which don't even abut, and it was AL and Tenn I think. But otherwise it sounded like a fun read.