Grab some superglue, some lab supplies, and you're good to go:
Set microscope slides, coverslips, and superglue outside when it's 20°F or colder to chill them. Catch flakes on the slides or pick them up with cold tweezers.
Place a drop of superglue on the snowflake. Note: Gel glue doesn't work. Find a brand that's thin and runny.
Drop a coverslip over the glue. Don't press down hard or the flake could tear or melt from the heat of your finger.
Leave the slide in a freezer for one or two weeks and don't touch it with warm hands. The glue must completely harden before the snowflake warms up.
(CC-licensed photo via Liz West!)
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