Season 5

Video thumbnail: It's Okay to Be Smart Do Fish Pee?

It's Okay to Be Smart

Do Fish Pee?

You know you’ve wondered. Do fish actually pee?

Do Fish Pee?

Video thumbnail: It's Okay to Be Smart Does Someone Else Have Your Face?

It's Okay to Be Smart

Does Someone Else Have Your Face?

They say everyone has a doppelgänger, but is that really true?

Does Someone Else Have Your Face?

Video thumbnail: It's Okay to Be Smart The Raisin Bran Effect

It's Okay to Be Smart

The Raisin Bran Effect

Where do you see the Brazil Nut Effect around you?

The Raisin Bran Effect

Video thumbnail: It's Okay to Be Smart Can We Get Older Without Aging?

It's Okay to Be Smart

Can We Get Older Without Aging?

What do other life forms have to teach us about staying alive as we get old?

Can We Get Older Without Aging?

Video thumbnail: It's Okay to Be Smart The Dinosaur On Your Thanksgiving Table

It's Okay to Be Smart

The Dinosaur On Your Thanksgiving Table

Eating turkey this holiday season? You’re eating a dinosaur!

The Dinosaur On Your Thanksgiving Table

Video thumbnail: It's Okay to Be Smart What is Farthest Away?

It's Okay to Be Smart

What is Farthest Away?

The edge of everything might not even exist…

What is Farthest Away?

Video thumbnail: It's Okay to Be Smart The Deadliest Flu Season in History?

It's Okay to Be Smart

The Deadliest Flu Season in History?

The 1918 Flu outbreak killed 5% of the world's population--could it happen again?

The Deadliest Flu Season in History?

Video thumbnail: It's Okay to Be Smart The Largest River On Earth Is In The Sky

It's Okay to Be Smart

The Largest River On Earth Is In The Sky

Scientists have discovered the largest river on Earth, and it’s in the sky above.

The Largest River On Earth Is In The Sky

Video thumbnail: It's Okay to Be Smart Where Do Teeth Come From?

It's Okay to Be Smart

Where Do Teeth Come From?

Teeth are made from some biological nanotechnology that will blow your mind.

Where Do Teeth Come From?

Video thumbnail: It's Okay to Be Smart What Do Raindrops Really Look Like?

It's Okay to Be Smart

What Do Raindrops Really Look Like?

Raindrops are shaped like teardrops, right? Wrong! Let's discover rain's true shape.

What Do Raindrops Really Look Like?

Video thumbnail: It's Okay to Be Smart Is Height All in Our Genes?

It's Okay to Be Smart

Is Height All in Our Genes?

Turns out the inheritance of height is a lot more complicated than we thought.

Is Height All in Our Genes?

Video thumbnail: It's Okay to Be Smart Will You Still Eat Raw Fish After Watching This Video?

It's Okay to Be Smart

Will You Still Eat Raw Fish After Watching This Video?

Ever wondered why restaurants warn you about raw or undercooked seafood on their menus?

Will You Still Eat Raw Fish After Watching This Video?

Video thumbnail: It's Okay to Be Smart How Habits are Formed

It's Okay to Be Smart

How Habits are Formed

Got a bad habit you can’t break? That’s because it’s literally wired into your brain.

How Habits are Formed

Video thumbnail: It's Okay to Be Smart How Some Words Get Forgetted

It's Okay to Be Smart

How Some Words Get Forgetted

English is confusing. Its irregular verbs can teach us a lot about how languages evolve.

How Some Words Get Forgetted

Video thumbnail: It's Okay to Be Smart 3 Incredible Examples of Evolution Hidden In Your Body

It's Okay to Be Smart

3 Incredible Examples of Evolution Hidden In Your Body

Here are some stories of how evolution and natural selection made you the way you are.

3 Incredible Examples of Evolution Hidden In Your Body

Video thumbnail: It's Okay to Be Smart The Only Animal That Weeps

It's Okay to Be Smart

The Only Animal That Weeps

Why do we cry? Here’s the science of human tears!

The Only Animal That Weeps

Video thumbnail: It's Okay to Be Smart The Surprising Reason We Eat Spicy Food

It's Okay to Be Smart

The Surprising Reason We Eat Spicy Food

Spices and other plant ingredients have powers that make them truly magical superfoods!

The Surprising Reason We Eat Spicy Food

Video thumbnail: It's Okay to Be Smart It's Okay to Fart

It's Okay to Be Smart

It's Okay to Fart

Farting is natural and here's how it works.

It's Okay to Fart

Video thumbnail: It's Okay to Be Smart Which Life Form REALLY Dominates Earth?

It's Okay to Be Smart

Which Life Form REALLY Dominates Earth?

This week we break down the concept of “biomass” to judge Earth’s living things.

Which Life Form REALLY Dominates Earth?

Video thumbnail: It's Okay to Be Smart The Cosmic Origins of Earth's Water

It's Okay to Be Smart

The Cosmic Origins of Earth's Water

The origin of water traces beyond the solar system to the earliest days of the universe.

The Cosmic Origins of Earth's Water