Extras
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
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?
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
Scientists look to geoengineering and other methods to cool the planet.
Can We Cool the Planet? Promo
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
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?
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
Can bringing predators—and fear—back into an ecosystem help restore its natural balance?
Nature's Fear Factor Preview
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
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
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
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
How Medieval Parchment is Made
Learn about the preparation and use of parchment paper in medieval Europe.
How Medieval Parchment is Made
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
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
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
Meet slime molds: the brainless blobs that can learn, make decisions, and navigate mazes.
Secret Mind of Slime Preview
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
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
Spacecraft OSIRIS-REx attempts to grab a piece of an asteroid to bring it back to Earth.
Touching the Asteroid Promo
Living with Sickle Cell Anemia
Sickle Cell Anemia is caused by a single change in the DNA sequence.
Living with Sickle Cell Anemia
We can now edit the human genome with a tool called CRISPR. But how far should we go?