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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Many theologians estimate that Jesus wasn't born on December 25 but sometime in September between 6BC and 30AD.
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The first Christmas card was designed in 1843 by J.C. Horsley.
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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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Gold-wrapped chocolate coins commemorate St Nicholas who gave bags of gold coins to 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 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 Christmas tree displayed in Trafalgar square in London is an annual gift to the UK from Norway since 1947. The Norwegian spruce given is a token of appreciation of British friendship during World War II from the Norwegian people.
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