Yesterday saw Day Two of the great showdown between man and machine on 'Jeopardy.' So, how did Watson do? Well, to say he spanked Jennings and Rutter would be an understatement. But the supercomputer did suffer an embarrassing setback during Final Jeopardy. The category: U.S. Cities. Watson's answer: "Toronto?????" Apparently its vast database of knowledge doesn't include third-grade geography.