Robins on cards were a joke 150 years ago when postmen wore red tunics and were named after them.
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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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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 tradition of putting tangerines in stockings comes from 12th-century French nuns who left socks full of fruit, nuts and tangerines at the houses of the poor.
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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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Gold-wrapped chocolate coins commemorate St Nicholas who gave bags of gold coins to the poor.
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