NASA Searching for Life on Mars

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A $2.5 billion, car-sized robot, nicknamed "Curiosity," is NASA's newest unmanned explorer. It's of...
A $2.5 billion, car-sized robot, nicknamed "Curiosity," is NASA's newest unmanned explorer. It's officially called the "Mars Science Laboratory" and it's being sent to the Red Planet to search for signs of life. John Blackstone reports.
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