More Evidence of Past Martian Water

I'd say that scientists are about 98% certain that Mars once had abundant liquid water on its surface, and we're finding more and more evidence of this all the time. The most recent evidence is salt deposits, similar to the salt flats on Earth in places like the western US. Of course the reason we are so interested in (past) liquid water on the surface of Mars is because here on Earth, everywhere there is liquid water there is life - we hope the same may be true for other worlds, as well. These salt deposits might be a place to hunt for fossilized evidence of Martian life.