JPL's recent press release mentions the evidence that the area the Rovers are exploring was not only wet once, but wet twice--which might explain why the press release is a bit repetitive:
About six months ago, Opportunity established that its exploration area was wet a long time ago. The area was wet before it dried and eroded into a wide plain. The team's new findings suggest some rocks there may have gotten wet a second time, after an impact excavated a stadium sized crater.Or are they worried that many people need to be told the news twice, to make sure it sinks in?
By six months ago, Opportunity had established that the area it is exploring was soaking wet long ago, before it dried and eroded into a wide plain. New findings raise the possibility that some rocks there may also have gotten wet a second time, after an impact excavated a stadium-sized crater in the plain.