SPACE - NASA's Curiosity finds two percent of Martian soil is comprised of water

We already knew Mars was blanketed in ancient riverbeds, which points to the existence of water in the distant past. What we didn't know, however, is that H2O exists on Mars in the here and now -- albeit embedded in Martian soil. A paper recently published in the journal Science revealed that as much as two percent of dirt from the Red Planet contains the precious liquid. The Curiosity rover gathered samples of the sand from the "Rocknest" area n ...

http://www.engadget.com/2013/09/27/nasa-water-martian-soil