At Racetrack Playa, thin ice, shallow water and light wind can combine to move rocks over slick mud. GPS and time-lapse observations documented the process. It is rare, which helped the mystery last for decades.
What we found
The stones leave long tracks, but movement often happens when nobody is watching. On cold nights a thin sheet of ice can form around rocks. As the ice breaks and wind pushes the panels, the rocks slide slowly across wet clay. The explanation requires an unusual combination of conditions, not magnetic forces or hidden animals. The Ridbusters then compare the wording with the original sources, look for the conditions of each observation and check whether another explanation could fit. That turns a surprising headline into a trail a young investigator can follow: claim, test, result and remaining uncertainty. At Racetrack Playa, thin ice, shallow water and light wind can combine to move rocks over slick mud.