"For memory and mental focus in general, the key is novelty," Farrow, author of " Brainhacker: Master Memory, Focus, Emotions, and More to Unleash the Genius Within ," tells CNBC Make It.
In one sitting, Farrow recalled the order of 52 shuffled decks, or 2,704 cards, when he was just 21 years old.
He even reclaimed the title after his record was broken, by memorizing the order of 59 decks of shuffled cards, which is 3,068 cards.
If there's anyone who can give you advice for strengthening your memory , it's Dave Farrow , two-time Guinness Record holder for memorizing the most decks of playing cards by a single sighting.
"The key is to trigger focus at will, not try to force your brain to focus for 24 hours."