The UK has been blanketed in snow for at least a week now.
So we couldn't resist making a Sixty Symbols video on the topic.
Initially I think Professor Phil Moriarty planned to discuss the shapes and properties of snowflakes - itself an interesting topic.
However when filming started, things kind of changed.
We teamed up with the the guys running the electron microscope to look at snow.
They showed us how thy are able to use a beam of ions to "engrave" at an unimaginable scale.
Displaying quite a sense of fun, they etched "Merry Christmas" onto a shard of snowflake
You can see a picture of it here.