7.6 million Christmas trees are sold each year.
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In Greek legend, malicious creatures called Kallikantzaroi sometimes play troublesome pranks at Christmas time. In order to get rid of them, salt or an old shoe is burnt. The pungent burning stench drives off, or at least helps discourage, the Kallikantza
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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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Although now mostly vegetarian, in Victorian times, mince pies were made with beef and spices.
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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 sun sets on 24 December at 3.55pm in the UK, and rises the following morning at 8.05am.
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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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'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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