'Jeopardy!' Whiz Mum on Rumored Defeat NEW YORK - "Jeopardy!" whiz Ken Jennings is not answering rumors that his streak is up, but he's not denying them either.    After a report posted on TV Week's Web site that the brainy software engineer lost in a show taped Tuesday (that would air this fall), Jennings fielded questions in an interview with Ellen Degeneres on her syndicated talk show...