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Be Smart

What’s In a 20,000 Year-Old Cube of Ice?

Season 7 Episode 22 | 11m 20s

Earth’s climate is changing in a big way, and it’s because there's more carbon dioxide in the atmosphere than at any point in our species’ history. But Earth’s climate has changed before. How do we know that this time we’re the cause? We know thanks to tiny bubbles of ancient atmosphere trapped in ice.

Aired: 10/06/19
Extras
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Episode: S12 E8 | 15:25
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Watch • 21:33
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Episode: S12 E5 | 21:33
Watch • 10:40
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The cosmic distance ladder is the world’s longest ruler, built to measure the universe.
Episode: S12 E4 | 10:40
Watch • 12:09
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Space is Full of Junk. Here’s How to Clean It Up…
Learn about the space junk problem and the giant space claw named ClearSpace-1 that might
Episode: S12 E2 | 12:09
Watch • 15:17
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On April 8, North America is getting a total solar eclipse. Here’s what you need to know.
Episode: S12 E3 | 15:17
Watch • 14:28
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These tiny pieces of an ancient asteroid could hold the secret to the origin of life.
Episode: S12 E1 | 14:28
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Watch • 10:00
Be Smart
Why trees look like rivers and also blood vessels and also lightning…
Why do the same, self-repeating patterns appear in trees, rivers, lightning, and even our bodies?
Episode: S12 E9 | 10:00
Watch • 4:13
Be Smart
You Are An Upside-Down Lobster
Here's why you aren't built like a lobster.
Episode: S2 E39 | 4:13
Watch • 15:25
Be Smart
The Real (Weird) Way We See Numbers
Our animal brains deal with quantities in very specific, and fascinating, ways.
Episode: S12 E8 | 15:25
Watch • 8:46
Be Smart
The Surprising Power of Sex in Evolution
Have you heard about Charles Darwin's lesser-know theory of evolution: sexual selection?
Episode: S12 E7 | 8:46
Watch • 12:54
Be Smart
Computers Can Predict When You're Going to Die… Here's How
Can new technologies make death prediction even more accurate?
Episode: S12 E6 | 12:54
Watch • 21:33
Be Smart
Can AI Help Us Talk to Whales?
AI may help us talk to whales soon. But should we?!
Episode: S12 E5 | 21:33
Watch • 10:40
Be Smart
Measuring the Universe With a 14-Billion Light-Year Ruler
The cosmic distance ladder is the world’s longest ruler, built to measure the universe.
Episode: S12 E4 | 10:40
Watch • 12:09
Be Smart
Space is Full of Junk. Here’s How to Clean It Up…
Learn about the space junk problem and the giant space claw named ClearSpace-1 that might
Episode: S12 E2 | 12:09
Watch • 15:17
Be Smart
Why the 2024 Solar Eclipse is Such a Big Deal
On April 8, North America is getting a total solar eclipse. Here’s what you need to know.
Episode: S12 E3 | 15:17
Watch • 14:28
Be Smart
Why NASA Punched an Asteroid
These tiny pieces of an ancient asteroid could hold the secret to the origin of life.
Episode: S12 E1 | 14:28