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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

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