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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Robins on cards were a joke 150 years ago when postmen wore red tunics and were named after them.
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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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There are 13 Santas in Iceland, each leaving a gift for children. They come down from the mountain one by one, starting on December 12 and have names like Spoon Licker, Door Sniffer and Meat Hook.
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The first postage stamp to commemorate Christmas was issued in Austria in 1937.
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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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7.6 million Christmas trees are sold each year.
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The "Urn of Fate" is part of the Christmas celebrations in many Italian households. The Urn of Fate is brought out on Christmas Eve. It holds a wrapped present for everyone. The mother tries her luck first, then the others in turn. If you get a present wi
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