7.6 million Christmas trees are sold each year.
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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 poinsettia is a traditional Christmas flower. In Mexico (its original birthplace), the poinsettia is known as the "Flower of the Holy Night".
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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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Frumenty was a spiced porridge, enjoyed by both rich and poor. It was a forerunner of modern Christmas puddings. It is linked in legend to the Celtic god Dagda, who stirred a porridge made up of all the good things of the earth.
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Although now mostly vegetarian, in Victorian times, mince pies were made with beef and spices.
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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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