It would be very interesting to find out how Watson actually interpreted both the category and the "answer". I don't know the actual amounts of time contestant

It would be very interesting to find out how Watson actually interpreted both the category and the "answer". I don't know the actual amounts of time contestants are given, but on TV the final category is disclosed many minutes ahead of the "answer". Then a contestant has perhaps 30 seconds to formulate a "question". An eternity for a massively parallel computer like Watson. Quite different from the rest of the show, which relies on lightning reflexes when played by "champions". Viewed from 30,000 feet (quite appropriate for an airport question, eh) I think that Watson didn't understand the category. Watson did not know what the words "US cities" meant. Those aren't words that would normally have any sort of double meaning, so if Watson understood the category, why would it have "ignored" category information? That doesn't make sense, especially for final Jeopardy. As Dr. Venkman might say: "good guess, but wrong!" In Watson's defense, it did not have very high confidence in its answer. We'll probably never know the real story. That's not the kind of information that IBM would want to disclose, mainly because it would probably make Watson look bad.