All the measurements of Martian soil made by a conductivity probe on the Phoenix Lander are consistent with extremely dry soil. There are no indications of thin films of moisture in the soil which is puzzling because the probe has sensed humidity rising and falling at the site. The Lander science team say measurements so far indicate soil that is thoroughly and perplexingly dry.
The team plans deeper tests of the soil, closer to the ice layer.
[right, conductivity probe. Credit, NASA, JPL-CalTech, UA, Texas A&M]