On a cracked lakebed in Death Valley called Racetrack Playa, there are a collection of boulders, some weighing several hundred pounds, that clearly, mysteriously, move. Hurricane force winds, sliding sheets of ice — and, of course, aliens — were all contenders, but then last December the cousins Richard Norris and James Norris caught the rocks in the act. In a paper published in Plos One, they describe watching a thin layer of ice break into large panes, then get pushed by a light wind against the boulders, which began to slide through the mud at about 15 feet a minute. "We were sitting on a mountainside and admiring the view when a light wind kicked up and the ice started cracking," Richard told the LA Times.
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