Many theologians estimate that Jesus wasn't born on December 25 but sometime in September between 6BC and 30AD.
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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 twelve days of Christmas are the days between Christmas Day and Epiphany (6th of January) and represent the length of time it took for the wise men from the East to visit the manger of Jesus after his birth.
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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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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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'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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The Christmas tree displayed in Trafalgar square in London is an annual gift to the UK from Norway since 1947. The Norwegian spruce given is a token of appreciation of British friendship during World War II from the Norwegian people.
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