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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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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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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Gold-wrapped chocolate coins commemorate St Nicholas who gave bags of gold coins to the poor.
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Robins on cards were a joke 150 years ago when postmen wore red tunics and were named after them.
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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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Nearly 60 million Christmas trees are grown each year in Europe.
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