A mysterious lake/oasis in the middle of the desert in Tunisia. As scientists wonder if it could be collected rainwater or water from the underl...

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A mysterious lake/oasis in the middle of the desert in Tunisia. As scientists wonder if it could be collected rainwater or water from the underlying aquifer, the people are enjoying swimming in it. The water has already changed colors indicating algal activity and lack of recycling of old water. http://www.theguardian.com/world/2014/aug/01/mysterious-lake-tunisian-desert-turquoise-green-sludge