US scientists calculated that Santa would have to visit 822 homes a second to deliver all the world's presents on Christmas Eve, travelling at 650 miles a second.
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7.6 million Christmas trees are sold each year.
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At Christmas, it is traditional to exchange kisses beneath the mistletoe tree. In ancient Scandinavia, mistletoe was associated with peace and friendship. That may account for the custom of "kissing beneath the mistletoe".
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The tradition of putting tangerines in stockings comes from 12th-century French nuns who left socks full of fruit, nuts and tangerines at the houses of the poor.
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Rudolph the red-nosed reindeer was invented for a US firm's Christmas promotion in 1938.
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The sun sets on 24 December at 3.55pm in the UK, and rises the following morning at 8.05am.
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In 1999, residents of the state of Maine in America built the world's biggest ever snowman. He stood at 113ft tall.
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The first Christmas card was designed in 1843 by J.C. Horsley.
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