A few links for Christmas, snow and the deep mid-winter.

The missing day and a rich one!  This PPt includes, towards the end, some guidance from Father Christmas including links to the NORAD plotting of the big delivery run.161211
A link to the clever guys at Caltech who spend their lives research snow and other, jolly cold, phenomenon.  http://www.its.caltech.edu/~atomic/snowcrystalsThese guys make movie snow and ice but will also sell you some (from their linked shop).  Amazing show reel.  http://www.snowbusiness.com
Finally from the days before the HSE a guide from a text for Victorian Gentlemen concerning how to enjoy yourself in the cold/snow.  modern_playmate_snow
Enjoy, Have a fine Christmas and New Year,
Best wishes for 2012 and beyond,

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