Quick: Who were the first 5 Presidents? Name all the foods you had for Thanksgiving dinner. What's your credit card number? Paul Mellor can tell you. Ok, he doesn't know your credit card number, but Paul has an amazing memory, and he can easily remember strings of numbers. This weekend, he participates in the annual USA Memory Championship in New York. Also in this episode: one of our occasional series, "Tough Jobs." Today, a luggage handler tells about his job.