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"Scientists can't figure out why these rocks - weighing up to several hundred pounds each - slide across a dry lake bed. The leading theory proposes that wind moves the rocks after a rain when the lake bed consists of soft and very slippery mud.
Visits to the Racetrack in January of 2005 documented in galleries 2 and 3 reveal the normally dry playa about a third then a sixth or less covered with up to 6 inches of water.
A follow-up investigation twelve days later in February 2005, documented in the 4 pages of gallery 4 reveals an abundance of long new tracks covered by a thin skin of water at the southeastern end of the playa.