Because there’s so many possible ways a snowflake can form. Not even looking at pressure, temp, etc. a snowflake has so many atoms in it that it is essentially never going to happen that two are EXACTLY the same.
Sounds interesting but if you think about it, that sandwich you just ate was likely unique as well. There’s trillions and trillions of molecules in there, and even just having one more or one less molecule makes it not exactly the same.
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