http://www.studio360.org/2011/feb/11/category-man-vs-machine/
Last year technology writer Clive Thompson visited Watson at IBM to watch him gear up for the big match. Clive told Kurt that thanks to the internet, scientists have fed millions of digitized documents into Watson’s “brain.†As soon as Alex Trebek gives the clue, Watson scans the documents and runs hundreds of algorithms to come up with the most statistically probable answer.
Watson is about the size of 10 refrigerators (and requires at least that much Freon to stay cool), but on Jeopardy! he'll appear as a tall flat screen monitor. According to Clive, his synthesized voice “sounds a little like the movie War Games… the computer that almost destroys the world in thermonuclear holocaust.â€