Mysterious Sailing Stones of Death Valley

In an area called the "Racetrack playa" in Death Valley near the western border of Arizona, an amazingly large number of stones, ranging in size from mere pebbles to half ton boulders regularly travel by themselves and no one has ever been able to explain why!

These huge stones move by themselves, leaving miles of zig-zagged, curved and straight tracks and continue to baffle the scientific community. As you can see these photos, the hardened surface of the landscape is marbled with the trails of water rivulets that would make concealing evidence of outside interference impossible. So the big question is, just how DO these mysterious stones move?