28 agosto 2014
Racetrack Playa is home to an enduring Death Valley mystery. Littered across the surface of this dry lake, also called a «playa,» are hundreds of rocks — some weighing as much as 320 kilograms (700 pounds) — that seem to have been dragged across the ground, leaving synchronized trails that can stretch for hundreds of meters.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/8p4PkFLnEhw/140828141902.htm
