4th Grade

Learn about the world of optics, where light bends to help us see the sights! Most of us rely on our eyes to see and understand the world. Yet, human eyes are far from perfect. Innovations such as glasses, goggles, and...

The Inka were master farmers, builders, and planners who lived in the Andes Mountains. This challenging environment required the Inka to develop innovative engineering solutions in order to farm, live, and thrive...

How much life can fit in one cubic foot? Photographer David Liittschwager and zoologist Chris Meyer learned the answer is: quite a lot! Learn how studying life in just one cubic foot can teach us about life on the...

What is it like to eat, sleep, and work in space? Find out as you read about life in a space station orbiting above Earth! Discover how astronauts function in a challenging environment that includes weightlessness,...

Scientists have studied mummies for a long time. They study the science behind them. But scientists also study more than just what happens. They study the culture of mummies. The culture is why mummies were made. Learn...

Aquariums allow people to explore underwater environments while keeping their feet on dry land. Learn how aquariums are created and how both their tiniest and mightiest members play big roles in these underwater...

The Wizard of Oz wasn't the first movie to use color. But it used color in a way that makes it hard to imagine the film without it. The Yellow Brick Road, the Emerald City, and Dorothy's iconic ruby slippers...

Magnets are the sparks that bring electric guitars to life! Learn how the guitar has changed over time and how it has impacted music. You'll also learn how electromagnets work and what they're made of. Follow the...

The stars in the sky are part of our galaxy, the Milky Way. Scientists have tried to map the Milky Way for centuries, but it is hard! The Milky Way is so large, scientists cannot simply take a picture of it. Discover how...

How did sailors long ago know how to get from here to there? They needed smarts, bravery, and tools of navigation! Many of the tools used then are still used in some form today. Modern technology allows navigation to be...

Long ago, farmers used natural farming methods. Then, faster ways to grow food were invented. Some of these methods were not natural. Organic farming has changed that. Farmers are working again with nature to grow...

Little green aliens have invaded the planet! No, not space invaders from Mars. These are plant invaders. Sure, they look harmless. But invasive species can wreak havoc on ecosystems. Learn how people are working to...