Rain in Southern Arizona is usually scarce – but on November 29th, 25 miles north of Tucson, the soil was soaked. Spouting from a network of pipes, thousands of gallons of water drizzled down onto the world’s only and largest man-made experimental watershed, recently completed at the University of Arizona’s Biosphere 2.  You can read articles from original Biosphere 2 scientist Jane Poynter here.

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