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A bicycle is a fun and efficient way to get from one place to another. But have you ever wondered what parts make up a bike? Some bikes have hand lever brakes while others do not. Riders with more experience usually set their seats a bit higher than those with less experience.

Even without cars or electricity, the Ancient Greeks had some pretty great thinkers. One of the greatest mathematical thinkers was Archimedes. Why do we always remember Archimedes yelling out "Eureka!" in the bathtub? Listen and find out!

During an era when women had few freedoms, there was one woman who spoke up for them. She was known as Nellie Bly, a pioneering female investigative reporter of her time. Well known for her record-breaking trip around the globe, her contributions also exposed corruption in a local hospital.

Have you ever wondered how pasta is made? While pasta only takes a few ingredients—flour, water, salt, and sometimes eggs—the process can be quite complex. Luckily, modern technology has greatly simplified the process from grain to flour, to dough, and finally to the pasta you find at the grocery store.

From water, to paint, to breakfast cereal, who could have guessed that all of these things have metal in them? There's metal all around! This story includes a fun experiment to pull iron out of cereal.

Have you ever wondered how a river forms, which animals live near rivers, or where those rivers lead? Rivers are a vital part of life and the ecosystem. Rivers help transport water to humans and animals as well. It can also be used to create energy. Water from rivers can end up in many different places downstream!

When on land, rivers, lakes, and oceans appear flat. With the aid of satellites, these bodies of water appear to have many designs! Explore the art of nature and how satellites detect the temperature of the many bodies of water around the globe.

Inventing is all about ideas—ideas for making products better or creating new ones. To put these ideas into action, young inventors need tools for tinkering. Find out how to put together your own inventor's workshop with simple tools and common household objects.

If you want to know what's going on, you check the news. But where does the news come from? Where do the reporters get their stories? Reporters ask five basic questions during an interview to gather all the facts and follow a few rules to keep the news truthful and fair.

People have always liked to know what's going on in the outside world. Today we can instantly access the news through the Internet. But how did people get the news before cell phones and TV? From ancient Rome to newspapers and telegraph machines, this story takes a brief look at how people have gotten the news throughout history.

When light has more energy, it creates short waves. When it has less energy, it has long waves. But only a small amount of these waves are visible to humans.

Making the perfect mirror surface of Chicago's Cloud Gate sculpture took a lot of work.

Electrons are extremely tiny charged particles that we can push around with magnets. This provides us with electricity.

Ice is nice, everyone agrees (in summer, anyway). But what is it, exactly?

Do you know how a star is born? Meet Stella, the star! Follow her as she shows you how stars form, live, and eventually go supernova! You will learn these processes as you meet her family—the Sun, Big Blue, and Supergiant. You will see how these different kinds of stars are able to use forces, such as gravity, atoms, and different elements help to create the beautiful night sky. Stella will help you understand how the millions of stars are able to dazzle you every night.

Not all gasses are the same, some are heavier than others. But how can you tell which gasses are heavier and which are lighter? This experiment will prove which gas is heavier: air or carbon dioxide.

Throughout history, people have loved practical jokes. Listen about a few of the more well-known jokes and pranks throughout history, including unicorns on the moon, a boat-car, and the Loch Ness monster.

Probability and odds are calculated by counting all the times something might happen and then how many times one particular outcome does happen.

Two coins are face-up side by side. What will happen if you roll one coin around the top of the other? Will the head be right-side up? Or upside-down?

Tiger sharks eat almost anything they can catch. But the practice of dumping garbage in oceans is harmful to these predators who tend to eat something without realizing it isn’t food. This causes tiger sharks to eat license plates and other non-food items they cannot digest.