NASAs Curiosity rover is doing an incredibly rare experiment on Mars

A NASA rover has used its last drop of a special chemical to analyze a Mars sample that may contain organics, the kinds of molecules life uses on Earth.After the Red Planet reemerged from conjunction — a period when NASA doesn't communicate with spacecraft because Mars is behind the sun from Earth's point of view in space — scientists began planning a rare type of experiment for the Curiosity rover. The robot has only conducted it once before in the 13 years it has roamed Mars.The ex