The first time "Jeopardy!" champion Ken Jennings went on the popular game show, the ultimate prize was millions in cash. But when he faces off against IBM's super computer Watson this week, he's not just playing for money -- he's playing for all of mankind.
For the past four years, top artificial intelligence researchers at IBM have been preparing their mega-machine, Watson, to compete on "Jeopardy!" against all-time champions Jennings and Brad Rutter.
To win, the machine needs not just to...Full Story