shelikes2read
Here's a cool article on the "sailing stones", which left tracks suggesting that they had moved themselves across the playa (dry lakebed). Scientists have worked hard to determine how the stones might have moved.
http://www.smithsonianmag.com/trave...tm_source=twitter.com&utm_handle=@smithsonian
http://www.smithsonianmag.com/trave...tm_source=twitter.com&utm_handle=@smithsonian