This weekend, post offices across the USA (& online) have begun offering a new set of 39-cent stamps featuring microscopic photos of snowflakes:
Ice crystals commonly begin as a piece of dust tumbling through the clouds. Gathering water molecules, they blossom into crystals with endlessly different patterns because of the constantly changing atmospheric conditions. This myriad of patterns has been classified within 7 basic forms by the International Commission on Snow.
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