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Elevators have transformed our cities and our lives, but how safe are they?
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The Ever-Expanding Universe: How telescopes have expanded our view of the universe

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The Mystery of the Milky Way: How telescopes have expanded our view of the universe
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NOVA  ·  Episode 3712

Emergency Mine Rescue

10/25/2010

Engineers and NASA scientists aid an all-out effort to save 33 trapped Chilean miners.

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