How do we really know there is no two identical snowflakes?

Question

I don’t really know what -illion word to use for how many snowflakes have fallen, but how do we know that out of all of them, no two are alike?

(Sorry if flair is incorrect)

In: Chemistry

Answer 1

Actually that saying is just about it being extremely unlikely. However, in 1988 Nancy Knight , a scientist at the National Center for Atmosphere Research in Boulder, Colorado, USA, found two identical examples while studying snow crystals from a storm in Wisconsin, using a microscope.

https://www.guinnessworldrecords.com/world-records/first-indentical-snow-crystals