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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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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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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One town in Indiana is called Santa Claus. There is also a Santa, Idaho.
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Gold-wrapped chocolate coins commemorate St Nicholas who gave bags of gold coins to the poor.
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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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