Skip to main content

Up Next

How Can You Make Flowers Last Longer?

How Can You Make Flowers Last Longer?

Season 3 Episode 21
3:09
Does Homeopathy Work?

Does Homeopathy Work?

Season 3 Episode 22
4:44
Why Do Onions Make You Cry?

Why Do Onions Make You Cry?

Season 3 Episode 24
2:18
Elephant Toothpaste

Elephant Toothpaste

Season 3 Episode 25
3:00
How Do Sparklers Work?

How Do Sparklers Work?

Season 3 Episode 27
2:23
Is Fluoride in Drinking Water Safe?

Is Fluoride in Drinking Water Safe?

Season 3 Episode 28
3:14
How Does Fluorescence Work?

How Does Fluorescence Work?

Season 3 Episode 29
3:23
How To Make a Fluorescent Flower

How To Make a Fluorescent Flower

Season 3 Episode 30
1:41
How Does Protein Build Muscle?

How Does Protein Build Muscle?

Season 3 Episode 31
3:40
Back to Show
Reactions

What's The Best Way To Whiten Teeth?

Season 3 Episode 20

It's with science, clearly. Many people have turned to over-the-counter teeth-whitening treatments. How do these work, and are they safe? This week, Reactions looks at the chemistry of a whiter smile.

Sign up now for inspiring and thought-provoking media delivered straight to your inbox.
Support Provided By
Season
Why Doesn’t Banana Candy Taste Like Banana?
10:04
We tracked it down to investigate if it’s as “banana-y” as the myth claims.
Why is Breast Milk Special (Making Better Formula)
7:26
We explore the sugar molecules in breast milk that make it so difficult to recreate.
The Science of Kombucha
8:12
We find out what it is and push its limits.
Why Does Fall Smell So Good?
7:25
What’s the chemistry behind those smells, and why do they make us so happy?
Do Your Dog’s Paws Smell Like Fritos?
4:45
The answer is yes! In this episode, we explore why.
How Can Fertilizer Explode?
6:10
Spoiler Alert! It's because of the ammonium nitrate.
We Found The Best Hot Pepper Cure (It’s Not Milk)
8:34
Sam and George suffer for science to find the best cure.
Color Changing Tea
4:00
Sam and George experiment with this tea to play with its spectacular colors.
Why Did the Sky Turn Orange in San Francisco?
3:54
We break down the Mars-like haze and how climate change is involved.
How Can A Margarita Do This?
3:47
We explore why margaritas have such an effect on the body when making it.
Cellulose: From Trees to Explosives
12:31
We get into how this tiny molecule holds up so much of our modern world.
The World's Biggest Batteries Aren't What You Think
14:13
We break down what a battery is and how they’re actually all around us.
Active loading indicator