FURTHER EVIDENCE OF MARS WATER INDICATOR

The Mars Curiosity rover computer problem is gradually being sorted, as further results from rock drilling have revealed important new evidence about the nature of water that once existed in the Gale Crater area on the Martian surface.

http://www.bbc.co.uk/news/science-environment-21755976

Curiosity has drilled into a rock which has been shown to contain clay minerals - with evidence of sulphur, nitrogen, hydrogen, oxygen, phosphorus and carbon. This indicates the rock studied was deposited in a fresh water environment. Previous studies showed an acidic water environment, which would be less likely to support micro-organisms.