The world's tallest Xmas tree at 221ft high was erected in a Washington shopping mall in 1950.
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Electric lights for trees were first used in 1895.
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Carols began as an old English custom called wassailing, toasting neighbours to a long life.
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Rudolph the red-nosed reindeer was invented for a US firm's Christmas promotion in 1938.
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In Greek legend, malicious creatures called Kallikantzaroi sometimes play troublesome pranks at Christmas time. In order to get rid of them, salt or an old shoe is burnt. The pungent burning stench drives off, or at least helps discourage, the Kallikantza
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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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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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