Namibian Fairy Circles
June 28, 2012 8:44 AM Subscribe
Namibian Fairy Circles "By comparing photos taken over a 4-year period, Walter Tschinkel confirmed something other scientists had suspected: The circles were alive—or at least they were dynamic. A number of circles appeared and disappeared over this time period. Extrapolating from the data, Tschinkel calculated that most smaller circles arise and vanish every 24 years, whereas larger circles last up to 75 years. Overall, the lifespan averaged 41 years."
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