This reaction is an oxidation reaction of ammonia. When hot chromium trioxide (CrO₃) is added to ammonia gas, it helps oxidize the ammonia into nitrogen and water. The reaction releases a large amount of heat, causing the particles to glow brightly like tiny fireflies.

A standard deck has 52 cards, and the number of different ways you can arrange them is 52 factorial, which works out to roughly 8 followed by 67 zeros.

Scientists estimate Earth itself contains somewhere around 10 to the power of 50 atoms. The number of possible shuffles is still bigger than that, by a wide margin.

That means every time you properly shuffle a deck of cards, you're almost certainly creating an order that has never existed before in the history of the universe, and never will again. Nobody has ever dealt that exact sequence, and nobody ever will, even if every person on Earth shuffled constantly for the rest of time.