10 Unsolved Desert Mysteries
10 Fairy Circles In the Namibian desert, millions of evenly spaced circles dot the landscape. Their edges are lined with knee-high grass, but nothing grows in the centers—not even when fertilized soil is added. The mystery surrounding the origin of these natural rings has inspired many theories over the decades, but none pan out to the satisfaction of everyone in the scientific community. Suggestions include the work of termites, sand-bathing ostriches and zebras, noxious plants and fungi killing circular patches of grass, subterranean gas, competing grasses, and levels of available nutrients in the soil....