Why are no two snowflakes the same?

From a distance, snowflakes may all look the same, but they are not. In fact, there are lots of different shapes of snowflakes -- not just those classic shapes you might try to replicate with paper cut-outs. Dr. Ken Libbrecht answers all of our snowflake questions: How are snowflakes made? Why are they different shapes? How is it that they're all unique? And how does a scientist who lives in southern California study snow? And, he also lets us in on his brush with a couple Arendelle princesses. Music in this episode by Podington Bear.

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