Real-life rolling stones creep across Death Valley in California - Telegraph

Real-life rolling stones creep across Death Valley in California - Telegraph:

"The rocks...move unaided in bizarre straight line patterns across the ultra-flat surface of the valley.

Scientists believe the pebbly phenomenon is caused by a melting-pot of specific weather conditions.

Studies suggest a combination of 90mph winds, ice formations at night and thin layers of wet clay on the surface of the desert all combine to push them along"