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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
It's the finale and two rounds of cooking remain before one of the finalists gets named the winner.
In week five, the home cooks have to make a dish from a family tradition and an heirloom recipe.
Shane meets species on the brink of oblivion, and the people who won’t let them slip away.
The home cooks prepare freshly made bread dishes and fruity treats for the annual bake sale.
From Highland pastures to global fashion, wool’s history is woven into Scotland’s identity.
From catwalk to castoff, Shane follows our tossed threads to the Chilean desert.
Shane explores how beavers once ruled North America — and how they might again.
A journey down the Colorado River reveals the ripple effects of humanity’s quest to conquer water.
A man dies on a bus and Bea is warned off the case, but she refuses to stop investigating.
Shane investigates the future of bees, from honey bees to wild native species, in a changing world.
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