Martian soil is apparently 2% water

http://www.nasa.gov/content/goddard/curiositys-sam-instrument-finds-water-and-more-in-surface-sample/#.UkYMXH87xSM
http://news.discovery.com/space/this-scoop-of-mars-soil-is-two-percent-water-130926.htm

And in happier news, more info about Martian soil and water.

Yup.

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