The tiny droplets of water that make up fog are so small that it would take seven thousand million of them to make a single tablespoonful of water.
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The fogs, which are more common in winter, occasionally cause havoc with air travel by lingering into the early afternoon.
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In Australia, Canberra wins the title of the 'foggiest' capital city with an average of 47 fogs each year.
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Sea fogs persist for more than 120 days a year on the Grand Banks, Newfoundland, Canada