Robins on cards were a joke 150 years ago when postmen wore red tunics and were named after them.
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The Queen's Christmas speech was first televised in 1957.
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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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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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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 sun sets on 24 December at 3.55pm in the UK, and rises the following morning at 8.05am.
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In 1999, residents of the state of Maine in America built the world's biggest ever snowman. He stood at 113ft tall.
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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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