One night I was watching a TV programme and there was an interview with a man called Dominic O'Brien, who had been the world memory champion five times He can remember the answers to all 7,500 Trivial Pursuit questions! He used to be a gambler and developed his own mental memory aid for each card in order to remember which cards had already been dealt and which ones hadn't Once he had perfected his system,he began to win serious money.