NASA's Robot Lab Curiosity Nears Mars

This undated image made available by NASA shows Mars' Gale Crater, looking south. The formation is 96 miles (154 kilometers) in diameter and holds a layered mountain rising about 3 miles (5 kilometers) above the crater floor. (AP Photo/NASA)(The Blaze/AP) -- The relentless heat that has blistered the United States and other parts of the world in recent years is so rare that it can't be anything but man-made global warming, a top government scientist says.As NASA's Curiosity rover gets closer to its early

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