“No one had ever seen these "sailing stones" move, but many photographed the end result. The original thought was that the lakebed forms a thin sheet of ice on it, and that the wind then blows the rocks across it; but that theory was discounted after researchers calculated it would take wind speeds of hundreds of miles per hour to move the rocks, while the wind at the Racetrack maxes out around 90 m.p.h. And if you're wondering why they don't just strap a GoPro camera onto a rock to see what's going on, scientists returning to the site over the years have calculated that the rocks move for short periods of time, just once every three years. That's a bit longer than your battery's likely to last.” - × × ×