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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
Why do we have different blood types? And why do we have blood at all?
How did dinosaurs become birds—and what good is half a wing?
Just how big would a telescope need to be to actually see an alien world in detail?
Dire wolves are back—sort of.
The key enzyme behind photosynthesis isn’t actually all that great at its job.
The oldest rocks on Earth are more than just ancient—they’re time machines!
This is one of the weirdest mysteries of human evolution: Why do we have grandmas?
Insects and birds have an awesome superpower that repels water and keeps them airborne in the rain.
Why do some people taste music or hear colors? Let’s talk about synesthesia.
How a chemical in lizard spit inspired one of the most important medical advancements.
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Why do we have different blood types? And why do we have blood at all?
How did dinosaurs become birds—and what good is half a wing?
Just how big would a telescope need to be to actually see an alien world in detail?
Dire wolves are back—sort of.
The key enzyme behind photosynthesis isn’t actually all that great at its job.
The oldest rocks on Earth are more than just ancient—they’re time machines!
This is one of the weirdest mysteries of human evolution: Why do we have grandmas?
Insects and birds have an awesome superpower that repels water and keeps them airborne in the rain.
Why do some people taste music or hear colors? Let’s talk about synesthesia.
How a chemical in lizard spit inspired one of the most important medical advancements.