3 facts
A 19×19 Go board has approximately 2.08×10¹⁷⁰ legal positions — vastly more than the estimated 10⁸⁰ atoms in the observable universe. This incomprehensible complexity is why DeepMind's AlphaGo (2016) was considered a historic AI breakthrough when it defeated world champion Go players.
A standard 52-card deck has 52! (factorial) possible arrangements — roughly 8 × 10⁶⁷. This number is so astronomically large that every time you properly shuffle a deck, the exact order of cards has almost certainly never existed before in the history of the universe.
This mind-boggling number is known as the Shannon Number, estimated to be around 10^120. The observable universe, by comparison, contains an estimated 10^80 atoms, highlighting the immense complexity of chess.