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NOVA

S39 Ep10: Deadliest Tornadoes Preview

Video duration: 0:30

Airs April 11, 2012 at 9pm on PBS

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Hunt for the Supertwister

Hunt for the Supertwister

Tornado-chasing scientists with an eye to better forecasting plumb the secrets of nature's most terrifying ...

Rate Tornado Damage

Rate Tornado Damage

Use the Fujita Scale of tornado intensity to assess the level of destruction left in the wake of actual tor...

Tornado Country

Tornado Country

How is it that with nearly 200 nations in the world, just one—the U.S.—gets up to three-quarters of all tor...

Killer Tornado of 1928

Killer Tornado of 1928

The remarkable story of 17-year-old Dale Larson and 29 Nebraskan schoolchildren shows how far tornado warni...

Episodes of NOVA44

Video thumbnail: NOVA S44 Ep9: Chinese Chariot Revealed

NOVA

S44 Ep9: Chinese Chariot Revealed

A team of experts rebuild an ancient battle chariot to help uncover its design secrets.

53:46

S44 Ep9: Chinese Chariot Revealed

53:46

Video thumbnail: NOVA S44 Ep8: Building Chernobyl's MegaTomb

NOVA

S44 Ep8: Building Chernobyl's MegaTomb

Engineers race to build a massive dome to contain the crumbling remains of the reactor.

52:55

S44 Ep8: Building Chernobyl's MegaTomb

52:55

Video thumbnail: NOVA S44 Ep7: Holocaust Escape Tunnel

NOVA

S44 Ep7: Holocaust Escape Tunnel

At ground zero for the final solution, scientists uncover a story of hope and bravery.

54:14

S44 Ep7: Holocaust Escape Tunnel

54:14

Video thumbnail: NOVA Treasures of the Earth: Power

NOVA

Treasures of the Earth: Power

Drill underground to see the treasures that power our world—today and into the future.

53:10

Treasures of the Earth: Power

53:10

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Clips of NOVA232

Video thumbnail: NOVA This Woman Helped Save Flint

NOVA

This Woman Helped Save Flint

LeeAnne Walters, of Flint, Michigan, helps save the city from a lead water crisis.

2:29

This Woman Helped Save Flint

2:29

Video thumbnail: NOVA WannaCry Cyberattack Explained

NOVA

WannaCry Cyberattack Explained

The WannaCry cyberattack cost the economy billions of dollars. Here's why that's scary.

1:56

WannaCry Cyberattack Explained

1:56

Video thumbnail: NOVA Meet the Gastric-Brooding Frog

NOVA

Meet the Gastric-Brooding Frog

These frogs barfed up their babies—and now scientists are trying to revive them.

5:29

Meet the Gastric-Brooding Frog

5:29

Video thumbnail: NOVA Poisoned Water Q&A with Scientists and Filmmakers

NOVA

Poisoned Water Q&A with Scientists and Filmmakers

What exactly went wrong in Flint—and what does it mean for the rest of the country?

2:00

Poisoned Water Q&A with Scientists and Filmmakers

2:00

Video thumbnail: NOVA Should You Wash Your Hands?

NOVA

Should You Wash Your Hands?

What do we really mean when we say that we’re clean?

4:40

Should You Wash Your Hands?

4:40

Video thumbnail: NOVA Front Row Seat to Saturn

NOVA

Front Row Seat to Saturn

Out near Saturn, the spacecraft Cassini has just entered its final and riskiest chapter.

2:39

Front Row Seat to Saturn

2:39

Video thumbnail: NOVA Holocaust Escape Tunnel Prologue

NOVA

Holocaust Escape Tunnel Prologue

In a forest in Lithuania, a team of scientists searches for traces of a vanished people.

2:03

Holocaust Escape Tunnel Prologue

2:03

Video thumbnail: NOVA Holocaust Survival Tale: Abe

NOVA

Holocaust Survival Tale: Abe

In Lithuania during WWII, Abe Gol’s father led Jewish prisoners in a tunnel escape.

7:22

Holocaust Survival Tale: Abe

7:22

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Previews of NOVA176

Video thumbnail: NOVA S44 Ep9: Chinese Chariot Revealed Preview

NOVA

S44 Ep9: Chinese Chariot Revealed Preview

A team of experts rebuild an ancient battle chariot to help uncover its design secrets.

0:30

S44 Ep9: Chinese Chariot Revealed Preview

0:30

Video thumbnail: NOVA S44 Ep10: Poisoned Water Preview

NOVA

S44 Ep10: Poisoned Water Preview

What exactly went wrong in Flint—and what does it mean for the rest of the country?

0:30

S44 Ep10: Poisoned Water Preview

0:30

Video thumbnail: NOVA Holocaust Escape Tunnel Q&A with Historians and Filmmakers

NOVA

Holocaust Escape Tunnel Q&A with Historians and Filmmakers

At ground zero for the final solution, scientists uncover a story of hope and bravery.

2:00

Holocaust Escape Tunnel Q&A with Historians and Filmmakers

2:00

Video thumbnail: NOVA Holocaust Escape Tunnel Preview 2

NOVA

Holocaust Escape Tunnel Preview 2

At ground zero for the final solution, scientists uncover a story of hope and bravery.

0:30

Holocaust Escape Tunnel Preview 2

0:30

See All Previews