ROCKS THAT MOVE ON THEIR OWN - CURIOUSER AND CURIOUSER

And yet no one finds this at all troubling or odd.....same as the aging backward jellyfish that came basically out of nowhere....

It's the time of year when the sailing stones of Racetrack Playa in California's Death Valley are on the move. Probably. No one has actually seen these huge rocks move along the flat, dry lake bed. But, we know they do. Sometime, when no one's looking, usually after freezing weather or heavy wind or rain, the rocks up and scoot themselves leaving unmistakable travel grooves in their wake. Extremely patient scientists studying the wanderliths have concluded that wetter winter weather plays a role in the stone rolling, but they're still not exactly sure how it all works. The sailing rocks are not small. Many are about the size of a loaf of bread and weigh upwards of 25 lbs. The dry lake bed that is Racetrack Playa is pancake flat. It's 4 1/2 miles long but only rises one inch along that entire length. Trails as long as 1,500 feet have been found. What's even more puzzling is sometimes you can follow these trails and there's no rock at the end of it. Rock trails will overlap, cross, travel in parallel, make wide curves, sharp turns, and zigzags.