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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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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One town in Indiana is called Santa Claus. There is also a Santa, Idaho.
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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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There are 13 Santas in Iceland, each leaving a gift for children. They come down from the mountain one by one, starting on December 12 and have names like Spoon Licker, Door Sniffer and Meat Hook.
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The Queen's Christmas speech was first televised in 1957.
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