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U.S. Polio Vaccines: Then and Now

U.S. Polio Vaccines: Then and Now

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A History of Vaccination

A History of Vaccination

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Immunity and Vaccines Explained

Immunity and Vaccines Explained

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Lawmakers Act on Outbreaks

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4:47
Secrets of Urban Archaeology

Secrets of Urban Archaeology

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Zombies and Calculus, Part 2

Zombies and Calculus, Part 2

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Zombies and Calculus

Zombies and Calculus

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Do We Live in a Multiverse?

Do We Live in a Multiverse?

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5:02
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Spinosaurus vs. Alligator

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2:41
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Balloon Animals

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Strange Captain Strange

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3:30
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Exclusive: Edward Snowden on Cyber Attacks

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NOVA

Hunting Planets

NASA’s Kepler mission lets us search for planets orbiting stars outside our solar system.