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NOVA

Oklahoma's Deadliest Tornadoes

Video duration: 53:06Expires: 12/15/15Video has closed captioning.

Hear harrowing stories from survivors of Moore’s massive tornado and meet scientists who stalk these ferocious storms.

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Hunt for the Supertwister

Hunt for the Supertwister

Tornado-chasing scientists with an eye to better forecasting risk their lives to plumb the secrets of natur...

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 NOVA39

Video thumbnail: NOVA Can Alzheimer's Be Stopped?

NOVA

Can Alzheimer's Be Stopped?

Join investigators as they untangle the cause of Alzheimer’s and race to develop a cure.

52:51

Can Alzheimer's Be Stopped?

52:51

Video thumbnail: NOVA Inside Einstein's Mind

NOVA

Inside Einstein's Mind

Retrace the thought experiments that inspired his theory on the nature of reality.

53:07

Inside Einstein's Mind

53:07

Video thumbnail: NOVA Making North America: Human

NOVA

Making North America: Human

How has the land shaped our lives, from the arrival of the first Americans to today?

53:02

Making North America: Human

53:02

Video thumbnail: NOVA Making North America: Life

NOVA

Making North America: Life

How did massive volcanic eruptions, inland seas, and land bridges pave the way for life?

53:32

Making North America: Life

53:32

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Clips of NOVA195

Video thumbnail: NOVA The Serengeti Lion Project

NOVA

The Serengeti Lion Project

After 50 years, Craig Packer & his team have records of the nearly 5,000 Serengeti lions.

1:37

The Serengeti Lion Project

1:37

Video thumbnail: NOVA NOVA Black Holes App

NOVA

NOVA Black Holes App

In this iPad app, navigate fields of cosmic objects in your quest to become a black hole.

1:00

NOVA Black Holes App

1:00

Video thumbnail: NOVA Make Your Own Hydrothermal Vent

NOVA

Make Your Own Hydrothermal Vent

A step-by-step guide to create your very own hydrothermal vent

1:44

Make Your Own Hydrothermal Vent

1:44

Video thumbnail: NOVA 3 Things "Faster Than Light"

NOVA

3 Things "Faster Than Light"

These three things have been said to go faster than light, but do they?

3:49

3 Things "Faster Than Light"

3:49

Video thumbnail: NOVA The Physics Behind Texting

NOVA

The Physics Behind Texting

When you send a text, how does your message make the journey to your friend’s phone?

3:37

The Physics Behind Texting

3:37

Video thumbnail: NOVA Saving the Montauk Lighthouse

NOVA

Saving the Montauk Lighthouse

A unique method to fight erosion saved the Montauk Point Lighthouse from disaster.

2:55

Saving the Montauk Lighthouse

2:55

Video thumbnail: NOVA Saving the Montauk Lighthouse

NOVA

Saving the Montauk Lighthouse

A unique method to fight erosion saved the Montauk Point Lighthouse from disaster.

2:51

Saving the Montauk Lighthouse

2:51

Video thumbnail: NOVA Gravity Changes Colors

NOVA

Gravity Changes Colors

This ingenious experiment proves that gravity changes the color of light all around us.

2:42

Gravity Changes Colors

2:42

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Previews of NOVA157

Video thumbnail: NOVA Great Human Odyssey Preview

NOVA

Great Human Odyssey Preview

Follow our ancient ancestors’ footsteps out of Africa and into every corner of our planet.

0:30

Great Human Odyssey Preview

0:30

Video thumbnail: NOVA Bombing Hitler's Supergun Preview

NOVA

Bombing Hitler's Supergun Preview

Discover how Allied forces conspired to destroy one of Hitler’s most diabolical weapons.

0:30

Bombing Hitler's Supergun Preview

0:30

Video thumbnail: NOVA Operation Lighthouse Rescue Preview

NOVA

Operation Lighthouse Rescue Preview

Join engineers as they race to rescue a historic lighthouse from certain doom.

0:30

Operation Lighthouse Rescue Preview

0:30

Video thumbnail: NOVA Viking Unearthed Sneak Peek

NOVA

Viking Unearthed Sneak Peek

Uncover the truth behind the legendary Vikings and their epic journey to the Americas.

2:27

Viking Unearthed Sneak Peek

2:27

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