After shuffling the cards in a standard 52-card deck, Alex Mullen, a three-time world memory champion, can memorize their order in under 20 seconds. As he flips though the cards, he takes a mental ...

So you say you have a wedding toast to memorize? A 20-minute speech you have to know by heart? A list of people’s names you absolutely must remember? Pshaw. Imagine delivering the long soliloquies of ...