Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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7.6 million Christmas trees are sold each year.
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Rudolph the red-nosed reindeer was invented for a US firm's Christmas promotion in 1938.
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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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At Christmas, it is traditional to exchange kisses beneath the mistletoe tree. In ancient Scandinavia, mistletoe was associated with peace and friendship. That may account for the custom of "kissing beneath the mistletoe".
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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 world's tallest Xmas tree at 221ft high was erected in a Washington shopping mall in 1950.
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