Tracy Vonder Brink

Microwaves heat our food. They carry messages from phone to phone. They help detect the weather. Microwaves are all around us, even if we don't see them. Listeners will learn about microwaves and how we use them every day.

Learn about the roles of airmen and their training, as well as the advanced equipment, aircraft, and weapons the Air Force uses.

Learn about the roles of Marines and their training, as well as the advanced equipment, aircraft, and weapons the Marines use to complete their tough missions.

Learn about the roles of Coast Guard members and their training, as well as the different types of ships, aircraft, and equipment this branch uses to complete its important missions around the world.

Learn about the roles of soldiers and their training, as well as the advanced equipment, vehicles, and weapons the Army uses. When duty calls, the Army is always ready to defend.

The U.S. Navy traces its roots back to the American Revolutionary War. Then, its small fleet was outnumbered. Today, it is the largest navy in the world.

Dive into the history, culture, and heritage of the state of Illinois with Who HQ! Learn about everything from the origins of the blues, gospel, and jazz to the history of the Chicago World’s Fair in this audiobook for young listeners. From the creators of the #1 New York Times bestselling Who...

Dive into the history, culture, and heritage of the state of Ohio with Who HQ! Learn about everything from its crucial positioning in the Civil War to the Ohio State University in this audiobook for young listeners. From the creators of the #1 New York Times bestselling Who Was? series comes a...

Take a ride on a rover with NASA as they explore the planet Mars. Learn how NASA explores Mars for evidence of life especially the existence of water. Scientists believe that life depends on water. Is it possible that Mars had life and why is it so different from Earth?

Hop to it! Do you know how or why a kangaroo hops and leaps? Learn how their legs, feet, and tail help a kangaroo move which starts with bouncing! Like humans, kangaroos' legs are made for how they move!

Have you ever been sick with strep throat? It's an illness caused by bacteria that gives you a painful sore throat! Learn how doctors can diagnose it by your symptoms and a test, and how medicine can cure strep throat so you can get better.

Aluminum was once more valuable than gold. A breakthrough in refining aluminum from rock transformed it from rare matter to sandwich wrapper. In this science story, you'll learn how two chemists, Charles Hall and Paul Héroult, solved the problem.