PBS Anywhere

Providing Support for PBS.org

It’s Okay to Be Smart

What is Wind?

Video duration: 2:38

Wind is everywhere. The air is constantly moving, sometimes gently, sometimes violently. Why? Pressure, temperature and rotation come together to make wind. Here's how.

Episodes of It’s Okay to Be Smart81

Video thumbnail: It’s Okay to Be Smart Why I'm Scared of Spiders

It’s Okay to Be Smart

Why I'm Scared of Spiders

The science of… OH GOD IS THAT A SPIDER?!

3:06

Why I'm Scared of Spiders

3:06

Video thumbnail: It’s Okay to Be Smart Why Does The Earth Have Layers?

It’s Okay to Be Smart

Why Does The Earth Have Layers?

…or why we live on an onion made of magma

4:31

Why Does The Earth Have Layers?

4:31

Video thumbnail: It’s Okay to Be Smart Why Do Clouds Stay Up?

It’s Okay to Be Smart

Why Do Clouds Stay Up?

There's nothing wrong with having your head in the clouds

5:13

Why Do Clouds Stay Up?

5:13

Video thumbnail: It’s Okay to Be Smart A Slice of Pizza Science!

It’s Okay to Be Smart

A Slice of Pizza Science!

How does math keep a folded slice from drooping?

3:32

A Slice of Pizza Science!

3:32

See all Episodes