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Teachable Moments

Transmissions

The mysterious inner-workings of a transmission are based on a “simple” bit of engineering—using Simple Machines, also known as gears.

Transponder

Once we’ve got a handle on radar, the next step is learning about transponders and why they work so well together.

Types of Clouds

Cloudy skies aren't always bad news. You can get the details with our explanation of the different types of clouds.

Watershed

We're willing to bet this is the most interesting explanation of watersheds you'll ever see, but you'll have to watch it to find out why.

What is Lightning?

In this "Lightning Round," we begin by explaining how lightning is created. And we end with a poem. (So you'll want to watch it all.)

What Is Weather?

Learn about weather and what causes it.

Who was Salmon P. Chase?

Learn more about Salmon P. Chase, Secretary of the Treasury from 1861 to 1864.

Why Money Has Value

Learn exactly what gives money its value.

Why Urine Is Tested

Learn why urine is tested and what the results indicate about your health.

Zoology

A peek into the field of Zoology.

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This content was developed under a grant from the U.S. Department of Education. However, this content does not necessarily represent the policy of the U.S. Department of Education, and you should not assume endorsement by the Federal Government.