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Extras

    Video thumbnail: NOVA North American Gold

    NOVA

    North American Gold

    When the Earth formed, most of the gold sunk to its core—but some remained trapped inside

    North American Gold

    Video thumbnail: NOVA Making North America: Human Preview

    NOVA

    Making North America: Human Preview

    How has the land shaped our lives, from the arrival of the first Americans up until today?

    Making North America: Human Preview

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