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A giant hole that appeared in a uniform layer of cloud over Mobile, Alabama, in the US, has left scientists puzzled.
Local resident Joel Knain said as he took pictures: "I immediately realized that I was seeing something unique."
Meteorological experts believe the hole formed when ice-crystals from a passing plane fell through the cloud, causing the water droplets in it to evaporate. [Continued with picture]
http://news.bbc.co.uk/1/hi/sci/tech/3394461.stm