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 first postage stamp to commemorate Christmas was issued in Austria in 1937.
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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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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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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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Gold-wrapped chocolate coins commemorate St Nicholas who gave bags of gold coins to the poor.
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The 26th of December is traditionally known as St Stephen's Day, but is more commonly known as Boxing Day. The reason it was called this is either alms boxes in church were opened and the money distributed to the poor, or alternatively it was named from t
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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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