Extras

    Video thumbnail: NOVA Kryptonite for Sharks

    NOVA

    Kryptonite for Sharks

    Marine biologist Patrick Rice is using rare earth elements to repel sharks.

    Kryptonite for Sharks

    Video thumbnail: NOVA Hunting the Elements Preview

    NOVA

    Hunting the Elements Preview

    A two-hour special from the producers of "Making Stuff"

    Hunting the Elements Preview

    Video thumbnail: NOVA Elemental Bloopers

    NOVA

    Elemental Bloopers

    Watch David Pogue's hilarious out-takes from NOVA's "Hunting the Elements."

    Elemental Bloopers