Snow comes in so many, often picturesque, forms that the International Commission on Snow and Ice issued a classification system in 1951. While the flakes usually prefer temperatures around the freezing point, those in this IncrediMail letter have adopted a special state of aggregation that allows them to thrive in emails — even if the recipient decides to take her laptop inside (which will be better for the computer, too):›› Christmas snow is falling gently in this silent letter, cuddling to your warm Christmas greetings. (IncrediMail)

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