There are more ways to arrange a deck of cards than there are atoms on Earth. If you’ve properly shuffled a deck of cards, it’s entirely likely you’re holding an arrangement that has never existed before- because a deck of 52 cards has 80,658,175,170,943,878,571,660,636, 856,403,766,975,289,505,440, 883,277, 824,000,000,000,000 permutations.