To attain the rank of grand master of memory, you must be able to perform three seemingly superhuman feats. You have to memorize 1,000 digits in under an hour, the precise order of 10 shuffled decks of playing cards in the same amount of time, and one shuffled deck in less than two minutes. There are 36 grand masters of memory in the world.

Joshua Foer

Joshua Foer

Able Amount Attain Cards Deck Deck Feats Grand Hour Less Master Masters Memorize Memory Minutes Must Order Perform Playing Precise Rank Same Seemingly Superhuman Than Three Time Two World You

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