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      7/25: Holmes letter may have warned of shooting; NASA's mission to Mars

      |James Holmes, the man accused in the Colorado theater massacre, sent a letter to one of his professors. In it, sources tell CBS News, he talked about shooting people and even included drawings of a gunman and his victims, reports John Miller; And, six hundred scientists had been working in obscurity for nine years designing the biggest and by far most complex Mars Rover: the one-ton Curiosity. Bill Whitaker reports NASA is making a big splash on this mission with a Hollywood type promotion campaign.

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