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Extras

    Video thumbnail: How We Got to Now Measuring Sound

    How We Got to Now

    Measuring Sound

    Introducing Harvey Fletcher, the man who invented a meter to measure noise pollution.

    Measuring Sound

    Video thumbnail: How We Got to Now Preview of Sound

    How We Got to Now

    Preview of Sound

    Here's what to look forward to in the episode 'Sound'.

    Preview of Sound

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