Here in western Maine we're expecting our second real snowstorm of the winter to arrive tonight. This has reminded me of a couple of educational videos that explain the science of snowflakes.
The Science of Snowflakes is a TED-Ed video lesson that explains how snowflakes are formed, why they're all different, and why seem to be "wetter" than others. The video also explains why all skiing is water skiing.
ByteSize Science also offers a good video about how snowflakes are formed.