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Why Do We Itch (ASL)

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?
Season 6 Episode 37 Length 04:59 Premiere: 05/18/18

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Season 6 Episodes

The Most Extreme Life Forms On Earth… And Beyond?
S6 E39 Length 05:24 Premiere Date 02/26/18

How to Figure Out the Day of the Week For Any Date Ever
S6 E38 Length 05:29 Premiere Date 01/16/18

Why Do We Itch (ASL)
S6 E37 Length 04:59 Premiere Date 05/18/18

Where Did Life Come From? (feat. PBS Space Time and Eons!)
S6 E37 Length 12:47 Premiere Date 05/07/18

Do Fish Pee?
S6 E36 Length 04:53 Premiere Date 12/27/18

Does Someone Else Have Your Face?
S6 E35 Length 12:42 Premiere Date 12/14/18

The Raisin Bran Effect
S6 E34 Length 05:19 Premiere Date 11/30/18

Can We Get Older Without Aging?
S6 E33 Length 08:53 Premiere Date 11/21/18

The Dinosaur On Your Thanksgiving Table
S6 E32 Length 10:16 Premiere Date 11/15/18

What is Farthest Away?
S6 E31 Length 06:08 Premiere Date 11/06/18

The Deadliest Flu Season in History?
S6 E30 Length 07:41 Premiere Date 10/31/18

The Largest River On Earth Is In The Sky
S6 E29 Length 05:30 Premiere Date 10/23/18

Where Do Teeth Come From?
S6 E28 Length 06:40 Premiere Date 10/09/18

What Do Raindrops Really Look Like?
S6 E27 Length 05:24 Premiere Date 09/25/18

Is Height Genetic?
S6 E26 Length 06:07 Premiere Date 09/18/18

Will You Still Eat Raw Fish After Watching This Video?
S6 E25 Length 06:33 Premiere Date 09/11/18

How Habits are Formed
S6 E24 Length 05:48 Premiere Date 09/04/18

How Some Words Are Forgotten
S6 E23 Length 10:49 Premiere Date 08/14/18

Why Do Disney Princesses All Look Like Babies?
S6 E22 Length 06:05 Premiere Date 08/07/18

Proof of Evolution Is Hiding in Your DNA
S6 E21 Length 08:03 Premiere Date 07/24/18

Why Do We Cry?
S6 E20 Length 04:20 Premiere Date 07/17/18

The Surprising Reason We Eat Spicy Food
S6 E19 Length 05:37 Premiere Date 07/10/18

The Science of Farts
S6 E18 Length 05:07 Premiere Date 06/26/18

Biomass - How Much Does Life on Earth Weigh?
S6 E17 Length 06:24 Premiere Date 06/20/18

What’s The Hottest Hot and Coldest Cold?
S6 E16 Length 05:11 Premiere Date 06/12/18

The Strange Evolutionary Story of the Thylacine
S6 E15 Length 07:48 Premiere Date 06/05/18

Where Did Earth's Water Come From?
S6 E14 Length 04:13 Premiere Date 05/22/18

This Salamander Can Regrow Limbs Like Deadpool
S6 E13 Length 07:16 Premiere Date 05/18/18

Why Do We Itch?
S6 E12 Length 04:59 Premiere Date 05/08/18

How Your Memory Works
S6 E11 Length 08:19 Premiere Date 05/01/18

97% of Climate Scientists Really Do Agree
S6 E10 Length 06:35 Premiere Date 04/19/18

Where Did Life Come From?
S6 E9 Length 12:46 Premiere Date 04/11/18

How To Bend Light Using Just Your Finger
S6 E8 Length 08:10 Premiere Date 04/03/18

Could You Ever Be Immune To EVERY Disease?
S6 E6 Length 06:13 Premiere Date 03/07/18

Why Are There As Many Males As Females?
S6 E5 Length 05:19 Premiere Date 02/22/18

How to Defuse the Overpopulation Bomb
S6 E4 Length 07:49 Premiere Date 02/13/18

Tuatara Time! – Face To Face With A Living Fossil!
S6 E3 Length 08:15 Premiere Date 02/07/18

Extreme Microbes Are Eating The Titanic
S6 E2 Length 05:24 Premiere Date 01/30/18

How to Figure Out the Day of the Week For Any Date Ever
S6 E1 Length 05:32 Premiere Date 01/16/18

Why Is Blue So Rare In Nature?
S6 E1 Length 08:06 Premiere Date 01/09/18

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