I found the story at CNN
Here.
I can get a five-dollar electronic gadget at the plant shop that tells me if soil is dry or not. Why the heck don't the rovers have a "finger" they can poke deep into the dirt that says "wet" or "not wet?" Hell, shove a paper towel down and see if it gets a blotch on it. Hit it with some heat and see if you get water vapor. Maybe there are such instruments and I don't know about it.