Slate has the scoop.

Watching Ken Jennings play is like witnessing any great athlete in top form: He's the Michael Jordan of trivia, the Seabiscuit of geekdom. Note his systematic habit of moving down the categories vertically, one by one, rather than skipping around the board. His nearly preternatural ability to land on the hidden Daily Doubles. His obscure betting tactics, which, as near as I can divine, are inspired by an obsessive-compulsive need to end each day's winnings with a round figure. His habit of adding some thematic je ne sais quoi to his answers (which, this being Jeopardy!, are of course phrased as questions.) If the topic is a foreign country, he'll answer in that country's accent, and in answer to one clue about hip-hop music, the ultra-white Ken memorably responded, "What is rap, yo?" Like a hot-dogging ball player insisting on his special end-zone touchdown dance, Jennings will no doubt take heat from some viewers for these stylistic quirks, but what the hell? It's show business, of a sort, and KenJen's antics have once again made Jeopardy!—which I hadn't watched regularly since matching wits with my Dad in high school—required viewing.

Have you seen this guy play Jeopardy? He's amazing.