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Why rumors about vaccines spread— and how to rebuild trust - Heidi Larson
lesson duration 16:08
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616,019 views
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519,885 views
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The genes you don't get from your parents (but can't live without)
lesson duration 05:03
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Blood, concrete, and dynamite: Building the Hoover Dam
lesson duration 05:12
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324,599 views
151,434 views
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