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If NASA's exploration of Mars were summed up in a bumper sticker, it would read: "Follow the water." Well, they've found the water — ice was discovered by the Phoenix lander in 2008. Now what? It's time to search again for signs of life, scientists say, something they haven't done since 1976. This time, they want to bring Martian rock and soil samples back to Earth. Here, they could be analyzed for fossilized traces of alien bacteria, or chemical or biological clues that could only be explained by something that was alive. Su...