Mystery Behind the ‘Sailing’ Stones of Death Valley Unveiled
http://www.scienceworldreport.com/articles/25807/20150521/mystery-behind-sailing-stones-death-valley-unveiled.htm
I mention sailing stones before and my theory at the time was water, pushed by winds, would move the stones. It seems the new research supports that idea but also suggests that algae/bacteria may lubricate the way a bit.