The definition of a white Christmas in the UK is for a single snow flake (perhaps amongst a shower of mixed rain and snow) to be observed falling in the 24 hours of December 25th.
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The first postage stamp to commemorate Christmas was issued in Austria in 1937.
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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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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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Many theologians estimate that Jesus wasn't born on December 25 but sometime in September between 6BC and 30AD.
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Rudolph the red-nosed reindeer was invented for a US firm's Christmas promotion in 1938.
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English Puritan leader Oliver Cromwell banned Christmas between 1647 and 1660 because he believed such celebrations were immoral for the holiest day of the year.
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Gold-wrapped chocolate coins commemorate St Nicholas who gave bags of gold coins to the poor.
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