Black Friday in the UK is the Friday before Christmas. Instead of shopping, many people get very drunk!
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Rudolph the red-nosed reindeer was invented for a US firm's Christmas promotion in 1938.
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There are 13 Santas in Iceland, each leaving a gift for children. They come down from the mountain one by one, starting on December 12 and have names like Spoon Licker, Door Sniffer and Meat Hook.
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Nearly 60 million Christmas trees are grown each year in Europe.
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Electric lights for trees were first used in 1895.
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Many theologians estimate that Jesus wasn't born on December 25 but sometime in September between 6BC and 30AD.
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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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