For decades the heavy rocks that carve trails across a Death Valley lakebed were never seen moving, until cameras caught them gliding on thin rafts of melting ice pushed by a light wind - Space Daily
On Racetrack Playa, stones heavy enough to need two hands leave grooves in the dried mud as if they walk. A weather station, fifteen GPS-fitted rocks and a set of time-lapse cameras finally recorded the cause, and it was almost nothing: a few millimeters of w…
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