Okay, not exactly ELI5, but I’ve tired to find a fairly reliable link: https://www.its.caltech.edu/~atomic/snowcrystals/alike/alike.htm
Sort answer : because showflakea are so sensitive to temperature changes and other factors as they fall to the ground, changing their shape as they go. It’s not impossible for two to be the same, but the probability is very small.
Small enough for for the notion to exist.
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