In another of my efforts to make the world a Better Place, and given that I feel just a teeny bit guilty that here it is so hot I pull the curtains and go to the back bedroom to work, (and I've just seen that the high for Frankfurt and London today was 0ºC and Sheffield was -2ºC,) I bring to you:
Why Snow is Good.
Enter, courtesy of physicist Kenneth Libbrecht, the fascinating world of snow crystals.
He has invented a way of growing and photographing snow crystals, and, from over 7,000 of them, has posted the best (most symmetrical) ones on his website. Apart from serving up a feast for the eyes, he explains how and why they grow, why they all have the hexagon shape in common, and gives examples of the different shape types. Very interesting! And well worth a visit.