Last night (25 November, 2008) saw me lose some amount of respect for Alex Trebek. One clue in the Double Jeopardy round amounted to asking for another name of “low-grade marble”. One person guessed “granite”. Obviously wrong. No one else guessed. The answer, Alex announced, was “limestone”, and then indicated that “granite, of course, is high-grade marble”. I’ve always known Alex to check his facts, get all the pronunciations of foreign names right, and be able to explain wrong answers. This time, he just couldn’t have been more wrong.