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More Extras

Scientists have a new tool to edit genes in human cells to repair mutations. What is it?
Clip: S44 | 1m 24s
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What is CRISPR gene editing?
Clip: S44 | 1m 24s

To make their delivery schedule, how quickly must Santa and his reindeer travel the world?
Clip: S44 | 3m 10s
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How Fast Does Santa Fly?
Clip: S44 | 3m 10s

In honor of the New Year, we bring you a NOVA retrospective on ballistics.
Clip: S44 | 1m 11s
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NOVA Goes Ballistic
Clip: S44 | 1m 11s

Could a safety technology have prevented a train crash in Washington that killed three?
Clip: S44 | 1m 20s
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How to Prevent Train Crashes
Clip: S44 | 1m 20s

Take a look back with us at the biggest science stories of 2017.
Clip: S44 | 3m 8s
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NOVA’s Big Ideas of 2017
Clip: S44 | 3m 8s

How Much Does a Thought Weigh?
Even in your mind, energy goes with it—bottle up that energy and it has mass.
Clip: S44 | 3m 57s
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How Much Does a Thought Weigh?
Clip: S44 | 3m 57s

Most wild turkeys are timid. But if one gets aggressive, what do you do?
Clip: S44 | 2m 36s
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When Turkeys Attack
Clip: S44 | 2m 36s

Climate Action Without the Feds?
Can states, cities, and companies fulfill US obligations to the Paris Accord on their own?
Clip: S44 | 2m 47s
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Climate Action Without the Feds?
Clip: S44 | 2m 47s

What's Inside the Great Pyramid?
Cosmic particles reveal a previously hidden void in the Great Pyramid of Khufu in Egypt.
Clip: S44 | 1m 45s
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What's Inside the Great Pyramid?
Clip: S44 | 1m 45s

What makes a brain or machine conscious? This theory is beginning to provide some answers.
Clip: S44 | 6m 13s
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Will Robots Become Conscious?
Clip: S44 | 6m 13s

If a neuroscientist designed a haunted house, would you dare to enter?
Clip: S44 | 3m 21s
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Why Do We Like Being Scared?
Clip: S44 | 3m 21s

What’s behind the recent surge in home runs in baseball?
Clip: S44 | 3m 15s
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Why Home Runs Are on the Rise
Clip: S44 | 3m 15s
Episodes

Watch as birds solve puzzles and challenge our basic notions of intelligence.
S44 Ep20 | 53m 30s
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Bird Brain
S44 Ep20 | 53m 30s

Scientists hunt for a mega-eruption that plunged medieval Earth into a deep freeze.
S44 Ep16 | 54m
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Killer Volcanoes
S44 Ep16 | 54m

Archaeological research uncovers provocative new clues about Stonehenge.
S44 Ep14 | 53m 36s
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Ghosts of Stonehenge
S44 Ep14 | 53m 36s

What exactly went wrong in Flint—and what does it mean for the rest of the country?
S44 Ep10 | 54m 7s
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Poisoned Water
S44 Ep10 | 54m 7s

Engineers are using origami to design drugs, micro-robots, and future space missions.
S44 Ep5 | 53m 50s
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The Origami Revolution
S44 Ep5 | 53m 50s

Explore the hidden world of energy storage and how it holds the keys to a greener future.
S44 Ep3 | 53m 32s
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Search for the Super Battery
S44 Ep3 | 53m 32s
Interactive
NOVA's Black Holes App
In this iPad app, navigate fields of cosmic objects in your quest to become a black hole.