When it comes to memorizing long strings of numbers, like a hundred thousand digits of pi or the career batting averages of every New York Yankee Hall of Famer, most mental athletes use a more complex technique that is known on the Worldwide Brain Club (the online forum for memory junkies, Rubik’s cubers, and mathletes) as “person-action-object,” or, simply, PAO. It traces its lineage directly back to the loopy combinatorial mnemonics of Giordano Bruno and Ramon Llull. In the PAO system, every two-digit number from 00 to 99 is represented by a single image of a person performing an action on
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