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        6-12

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        Part of How We Got to Now
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        The Quest for Clean Water | How We Got to Now: Clean

        Discover how John Leal found the solution to ridding bacteria from dirty water with chlorine at the turn of the 20th century in this clip from How We Got to Now. Support Materials include a background essay on the history of attempts to rid water of bacteria, teaching tips to foster innovation and bring concepts from this clip into the social studies, science, and math classrooms, as well as pre-viewing and post-viewing discussion questions.

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