Are geoengineering insects behind Africa's bizarre fairy circles?

A German scientist has come up with an explanation for the strange rings of grass that pockmark vast expanses of Africa's Namib Desert: A sand termite known as Psammotermes allocerus. These circles are actually tiny oases built by the insects — and they can allow life to persist in the harsh conditions for hundreds of… »3/29/13 10:00am3/29/13 10:00am