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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At Christmas, it is traditional to exchange kisses beneath the mistletoe tree. In ancient Scandinavia, mistletoe was associated with peace and friendship. That may account for the custom of "kissing beneath the mistletoe".
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One town in Indiana is called Santa Claus. There is also a Santa, Idaho.
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The Queen's Christmas speech was first televised in 1957.
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The first Christmas card was designed in 1843 by J.C. Horsley.
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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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'Klaxon' is a name that does not belong to one of Santa's reindeer. A klaxon is actually a powerful electric horn. Its name comes from a German word meaning "shriek".
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