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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Electric lights for trees were first used in 1895.
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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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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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Black Friday in the UK is the Friday before Christmas. Instead of shopping, many people get very drunk!
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The abbreviation Xmas isn't irreligious. The letter X is a Greek abbreviation for Christ.
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The first Christmas card was designed in 1843 by J.C. Horsley.
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