Electric lights for trees were first used in 1895.
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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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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 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 first Christmas card was designed in 1843 by J.C. Horsley.
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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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Nearly 60 million Christmas trees are grown each year in Europe.
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