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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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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The abbreviation Xmas isn't irreligious. The letter X is a Greek abbreviation for Christ.
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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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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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7.6 million Christmas trees are sold each year.
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Although now mostly vegetarian, in Victorian times, mince pies were made with beef and spices.
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