NASA's Curiosity rover has found definitive proof that water once ran across the surface of Mars, the agency announced today. NASA scientists say new photos from the rover show rocks that were smoothed and rounded by water. The rocks are in a large canyon and nearby channels that were cut by flowing water, making up an alluvial fan.
"You had water transporting these gravels to the downslope of the fan," NASA researchers say. The gravel then formed into a conglomerate rock, which was in turn likely covered before being exposed again.
A battle is under way in Iowa over whether a state Supreme Court justice can keep his job.
Critics have launched an all-out campaign to throw him off the bench because of his ruling three years ago clearing the way for same-sex marriage. The judge's supporters are fighting back, but they may need to get over their reluctance to mix politics and the judiciary.
One topic you don't hear much about from Republican presidential nominee Mitt Romney is climate change. Like so much else, it's become politically divisive, with polls showing Republicans far less likely to believe in it or support policies to address it.
But two new groups aim to work from within, using conservative arguments to win over skeptics.