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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Black Friday in the UK is the Friday before Christmas. Instead of shopping, many people get very drunk!
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Gold-wrapped chocolate coins commemorate St Nicholas who gave bags of gold coins to the poor.
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The Queen's Christmas speech was first televised in 1957.
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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 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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The sun sets on 24 December at 3.55pm in the UK, and rises the following morning at 8.05am.
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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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