Let it snow, let it snow, let it snow. Christmas songs and holiday cards abound in pictures of pristine landscapes covered in fresh powder. But what exactly is that white stuff, anyway? In a little over two minutes, The Chemistry of Snowflakes gives us the answer. The film is the latest installment in the Bytesize Science series from the American Chemical Society. It's an interesting look at a beautiful subject--and much more fun to think about than, say, the physics of shoveling.