Extras

Video thumbnail: NOVA Repairing Notre Dame's Vaults with Underground Quarries

NOVA

Repairing Notre Dame's Vaults with Underground Quarries

Hidden under Paris is a rich source of limestone, a vast labyrinth of quarry tunnels.

Repairing Notre Dame's Vaults with Underground Quarries

Video thumbnail: NOVA What is Solar Geoengineering and Why is it Controversial?

NOVA

What is Solar Geoengineering and Why is it Controversial?

Solar geoengineering is like drawing a curtain over the face of the Earth.

What is Solar Geoengineering and Why is it Controversial?

Video thumbnail: NOVA Meet the NASA Scientist Who Uses Lasers to Study Forests

NOVA

Meet the NASA Scientist Who Uses Lasers to Study Forests

This researcher shoots lasers at trees in order to measure how much carbon forests store.

Meet the NASA Scientist Who Uses Lasers to Study Forests

Video thumbnail: NOVA How Much Coal Do People Burn Each Year?

NOVA

How Much Coal Do People Burn Each Year?

See how much CO2 we add to the atmosphere each year.

How Much Coal Do People Burn Each Year?

Video thumbnail: NOVA Can We Cool the Planet? Promo

NOVA

Can We Cool the Planet? Promo

Scientists look to geoengineering and other methods to cool the planet.

Can We Cool the Planet? Promo

Video thumbnail: NOVA Inside OSIRIS-REx’s Mission to Tag Asteroid Bennu

NOVA

Inside OSIRIS-REx’s Mission to Tag Asteroid Bennu

Learn more about OSIRIS-REx’s mission to an asteroid 200 million miles away.

Inside OSIRIS-REx’s Mission to Tag Asteroid Bennu

Video thumbnail: NOVA Did This Asteroid Just Turn into a Comet?

NOVA

Did This Asteroid Just Turn into a Comet?

Everything in the solar system is dynamic—you can watch it evolve in real time.

Did This Asteroid Just Turn into a Comet?

Video thumbnail: NOVA Asteroids Provide Hints About the "Ingredients" in Planets

NOVA

Asteroids Provide Hints About the "Ingredients" in Planets

By studying asteroids, researchers can learn about the formation of planets.

Asteroids Provide Hints About the "Ingredients" in Planets

Video thumbnail: NOVA Nature's Fear Factor Preview

NOVA

Nature's Fear Factor Preview

Can bringing predators—and fear—back into an ecosystem help restore its natural balance?

Nature's Fear Factor Preview

Video thumbnail: NOVA Meet Gorongosa National Park’s Head Veterinarian

NOVA

Meet Gorongosa National Park’s Head Veterinarian

Hear what it’s like to be a vet for wild animals.

Meet Gorongosa National Park’s Head Veterinarian

Video thumbnail: NOVA Lions Return to Mozambique's Gorongosa National Park

NOVA

Lions Return to Mozambique's Gorongosa National Park

Gorongosa National Park was once one of the most species-rich places in Africa.

Lions Return to Mozambique's Gorongosa National Park

Video thumbnail: NOVA The Anatomy of an African Wild Dog Hunt

NOVA

The Anatomy of an African Wild Dog Hunt

Lions and African wild dogs hunt their prey very differently.

The Anatomy of an African Wild Dog Hunt

Video thumbnail: NOVA A to Z: How Writing Changed the World Promo

NOVA

A to Z: How Writing Changed the World Promo

The creation of printing, the first information technology, drove empires and revolutions.

A to Z: How Writing Changed the World Promo

Video thumbnail: NOVA How Medieval Parchment is Made

NOVA

How Medieval Parchment is Made

Learn about the preparation and use of parchment paper in medieval Europe.

How Medieval Parchment is Made

Video thumbnail: NOVA A to Z: The First Alphabet Preview

NOVA

A to Z: The First Alphabet Preview

The birth of writing and the first alphabet were among the world’s most vital inventions.

A to Z: The First Alphabet Preview

Video thumbnail: NOVA How Egyptian Hieroglyphs Influenced Modern Alphabets

NOVA

How Egyptian Hieroglyphs Influenced Modern Alphabets

Learn why Egyptian hieroglyphs are hiding in modern alphabets—and how to find them.

How Egyptian Hieroglyphs Influenced Modern Alphabets

Video thumbnail: NOVA Aboriginal Elder Sings Ancient Creation Song

NOVA

Aboriginal Elder Sings Ancient Creation Song

In the Wardaman Creation Story, all the plants and animals of the world were once people.

Aboriginal Elder Sings Ancient Creation Song

Video thumbnail: NOVA Secret Mind of Slime Preview

NOVA

Secret Mind of Slime Preview

Meet slime molds: the brainless blobs that can learn, make decisions, and navigate mazes.

Secret Mind of Slime Preview

Video thumbnail: NOVA The Great Australian Slime Mold Bakeoff

NOVA

The Great Australian Slime Mold Bakeoff

The purpose of this experiment was to see how Physarum regulates its nutritional needs.

The Great Australian Slime Mold Bakeoff

Video thumbnail: NOVA Brainless Slime Molds Navigate Mazes and Make Decisions

NOVA

Brainless Slime Molds Navigate Mazes and Make Decisions

Can a slime mold find food placed at the far end of a labyrinth?

Brainless Slime Molds Navigate Mazes and Make Decisions

Video thumbnail: NOVA Touching the Asteroid Promo

NOVA

Touching the Asteroid Promo

Spacecraft OSIRIS-REx attempts to grab a piece of an asteroid to bring it back to Earth.

Touching the Asteroid Promo

Video thumbnail: NOVA Living with Sickle Cell Anemia

NOVA

Living with Sickle Cell Anemia

Sickle Cell Anemia is caused by a single change in the DNA sequence.

Living with Sickle Cell Anemia

Video thumbnail: NOVA Human Nature Sneak Peek

NOVA

Human Nature Sneak Peek

We can now edit the human genome with a tool called CRISPR. But how far should we go?

Human Nature Sneak Peek