4th Grade

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...

Did you know that steam can be used to power engines? In fact, steam power drastically changed the manufacturing and transportation industries. Learn about the history of steam power and the engineers who made it...

Seismologists have an important job. These scientists study earthquakes. Why is it so important to study earthquakes? By studying quakes, seismologists can help protect people from injury and death. Learn about the men...

  The clouded leopard is a shy and reclusive cat. This relative of lions and tigers is an endangered species. Their shy nature makes studying them difficult for zookeepers and scientists. Discover what makes them so...

The first prosthetic devices consisted of wooden legs and hooks for hands. Today, many prostheses and bionics can do everything a natural limb can do--and more! Learn about inventions from the past that have been...

Streams are an important part of our world. They are the source of drinking water for countless plants and animals. But many streams are eroding. In Maryland, there is a huge effort to restore Muddy Creek. Find out what...

People at Smithsonian's National Zoo and Conservation Biology Institute are working hard to save animal species from extinction. Meet five animals they have saved and learn about the people on a mission to save...

History is everywhere you look. But what happens when there is a disaster, such as a flood or an earthquake? People called conservators visit places hit by disasters. They work to save the items that represent the local...

Migration has huge benefits for birds, but the benefits of migration come at a cost. Learn how ornithologists are using modern technology to help these long-distance travelers. Created in collaboration with...

The Arctic ecosystem is changing. The temperature is getting warmer, and the polar ice is melting. Polar scientists from around the world study the Arctic because changes there affect the entire planet. What have...

How can you make ice cream creamier? What packaging keeps cookies fresh the longest? And how do you make potato chips that taste like a cheeseburger? These are some of the problems that a food scientist tries to...

Landsat satellites are the superheroes of space. They orbit Earth to get images. These images can help stop catastrophes, and solve great mysteries. From poisoned water to raging fires, Landsat sees it all. Discover how...