Christmas trees become popular in the UK from 1841 when Prince Albert erected a tree in Windsor Castle following a German tradition. Fir trees have been decorated at Christmas time in Germany since the 8th century.
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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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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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In 1999, residents of the state of Maine in America built the world's biggest ever snowman. He stood at 113ft tall.
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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 world's tallest Xmas tree at 221ft high was erected in a Washington shopping mall in 1950.
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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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