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Terrifying moments of high danger on the International Space Station, when ingenuity and teamwork keep astronauts alive as they do remarkable science in space.

NOVA

Operation Space Station: High-Risk Build

Exploring why dangerous floods are on the rise in the U.S. and what can be done to protect more lives when they strike.

Superfloods

How Homo sapiens lived alongside Neanderthals and how they helped make us who we are today.

Human: Neanderthal Encounters

The military technologies that helped propel the colonies to victory, from the Brown Bess musket to the world's first military submarine.

Revolutionary War Weapons

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Astrophysicists and engineers look at evidence that supports the existence of UFOs.

S52 E1 | What Are UFOs?

E19 | Operation Space Station: High-Risk Build

E18 | Superfloods

E14 | Human: Neanderthal Encounters

E7 | Revolutionary War Weapons