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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The first postage stamp to commemorate Christmas was issued in Austria in 1937.
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'Klaxon' is a name that does not belong to one of Santa's reindeer. A klaxon is actually a powerful electric horn. Its name comes from a German word meaning "shriek".
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The twelve days of Christmas are the days between Christmas Day and Epiphany (6th of January) and represent the length of time it took for the wise men from the East to visit the manger of Jesus after his birth.
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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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The first Christmas card was designed in 1843 by J.C. Horsley.
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Gold-wrapped chocolate coins commemorate St Nicholas who gave bags of gold coins to the poor.
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