He is also the first to memorize more than 3,000 decimal digits in one hour .
He is the first person to memorize the order of a deck of playing cards in under 20 seconds at an official competition .
person is also the first to memorize more than 3,000 decimal digits in one hour .
He is the first person to memorize the order of a deck of playing cards in under 20 seconds at an official competition .