From the air, the Namibian desert looks like it has a bad case of chicken pox. Spread across 1,100 miles of a narrow strip sit a smattering of barren polka dots, otherwise known as fairy circles. These sizable craters measure 10- to 65-feet in diameter, and represent one of nature’s greatest mysteries. Over the decades, a number of theories, from alien invasion to poisonous gasses have been put forth to […]