It is said that no two snowflakes are identical. Each contains about a billion billion water molecules, so the number of possible configurations is enormous. These photographs by Patricia Rasmussen are from The Snowflake: Winter's Secret Beauty by Kenneth Libbrecht (Voyageur Press, $20).
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Let it snow. Nature 426, 766 (2003). https://doi.org/10.1038/426766b
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DOI: https://doi.org/10.1038/426766b