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Be Smart

Why Do We Itch (ASL)

Season 6 Episode 37 | 4m 59s

It’s one of the most annoying sensations our bodies can feel, but does anything feel better than when you scratch an itch? Ok, maybe *some* things. But itching and scratching are up there. How does this weird sensation work? And what is itching for?

Aired: 05/17/18
Extras
Watch • 16:27
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Episode: S12 E12 | 16:27
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Despite what you may have heard or learned in school, the sun is NOT the center of the solar system.
Episode: S12 E11 | 11:43
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Why You See Faces in Things
People see faces everywhere thanks to a quirk of the brain called visual pareidolia.
Episode: S12 E10 | 10:23
Watch • 10:00
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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
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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
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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
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Episode: S12 E4 | 10:40
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Watch • 16:27
Be Smart
Why Do We Hate Certain Sounds
Why do certain sounds make some of us so upset?!
Episode: S12 E12 | 16:27
Watch • 11:43
Be Smart
The Sun is NOT the Center of the Solar System
Despite what you may have heard or learned in school, the sun is NOT the center of the solar system.
Episode: S12 E11 | 11:43
Watch • 10:23
Be Smart
Why You See Faces in Things
People see faces everywhere thanks to a quirk of the brain called visual pareidolia.
Episode: S12 E10 | 10:23
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