In celebration of today's Boston Marathon, the Lunchtime Quiz at mental_floss pits celebrity marathon runners against each other. From ten matched pairs of celebrities, you decide which one could best the other in a marathon race. The secret is that they have all participated in marathons at one time or another and have recorded times, but they didn't necessarily run in the same year, or at the same age. I scored 50%, which tells you I am not a particularly good guesser. Link