How Much Does a Thought Weigh?
NOVA
How Much Does a Thought Weigh?
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NOVA
How Much Does a Thought Weigh?
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More Extras
Scientists have a new tool to edit genes in human cells to repair mutations. What is it?
What is CRISPR gene editing?
To make their delivery schedule, how quickly must Santa and his reindeer travel the world?
How Fast Does Santa Fly?
Could a safety technology have prevented a train crash in Washington that killed three?
How to Prevent Train Crashes
Climate Action Without the Feds?
Can states, cities, and companies fulfill US obligations to the Paris Accord on their own?
Climate Action Without the Feds?
What's Inside the Great Pyramid?
Cosmic particles reveal a previously hidden void in the Great Pyramid of Khufu in Egypt.
What's Inside the Great Pyramid?
What makes a brain or machine conscious? This theory is beginning to provide some answers.
Will Robots Become Conscious?
New Kind of Astrophysics is Born
Scientists saw and “heard” a dramatic cosmic explosion simultaneously for the first time.
New Kind of Astrophysics is Born
Episodes
Experts drill into the impact crater of an asteroid that created a worldwide cataclysm.
Day the Dinosaurs Died
NOVA uncovers the secrets of nature’s battleground—claws, horns, fangs and all.
Extreme Animal Weapons
Scientists uncover geologic evidence of epic floods that tore through ancient landscapes.
Killer Floods
Experts reconstruct the Great Hurricane of 1780 to help predict the risk of future storms.
Killer Hurricanes
Scientists hunt for a mega-eruption that plunged medieval Earth into a deep freeze.
Killer Volcanoes
How has China’s magnificent Forbidden City withstood centuries of earthquakes?
Secrets of the Forbidden City
Discover the world of medieval knights and see how their armor was made.
Secrets of the Shining Knight
Follow Cassini's final days as it skims the cloud tops before plunging into the planet.
Death Dive to Saturn
The country’s first solar eclipse in 99 years will cast a light on the Sun’s secrets.
Eclipse Over America
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