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        6-12

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        Auditory, Visual

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        NOVA | A Hole in the Sky

        Great inventions sometimes have unintended consequences. Such was the case with a non-toxic, non-reactive gas produced in the 1920s. This video segment adapted from Interactive NOVA describes the discovery that led to the fall of chlorofluorocarbons, once heralded as miracle compounds and now scientifically documented as destroyers of an atmospheric gas critical to life on Earth.

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