4th Grade

Frogs are amazing animals that face danger from climate change and habitat loss. Now a deadly fungus threatens them, too. Scientists are working hard to save them. Can these amphibians bounce back before it's too...

Millions of blue crabs are caught in the Chesapeake Bay each year. But there is a big problem brewing in the bay. The blue crab population is shrinking. Why? Scientists and watermen have teamed up to study the lives of...

Imagine having a job where you get paid to draw! Botanical illustrators draw detailed illustrations of plants. Learn about this job, the tools that are used, and how it helps science. In this STEAM career, the beauty is...

Imagine changing the color of your skin or even your shape in an instant. If you were a cephalopod, you wouldn't have to imagine it--you could to it! Scientists are closely studying them to learn how to mimic their...

The Horten Ho 229 was an experimental German airplane created by the Nazis. They believed its innovative design would help them win the war. Although this experimental aircraft never worked as planned, it's still...

How do you build a reusable spacecraft that is strong enough to hold up in outer space, but is light enough to fly? How do you design it to meet the needs of the astronauts it carries? In the 1970s, NASA...

Many butterfly species are in decline. Fortunately, people can see butterflies up close at butterfly exhibits. What steps are required to plan and create a butterfly exhibit? Learn about the challenges that...

Visitors from across the country and around the world flock to U.S. national parks to explore their beauty. Little do they know that the National Park Service (NPS) has been guiding and enhancing their experience for...

Many people go to museums to see dinosaur fossils. But visitors would never get to see these displays without the work of paleontologists. They locate fossils, dig them up, and send them to a lab to be cleaned and...

Electric vehicles, or EVs, have been around for over 100 years. The first EV that people could buy went on sale in 1894. The "Electrobat" could go 25 miles on one battery charge. Today's EVs are light, speedy,...

Volcanoes can burn hotter than anything on the Earth's surface. But there is no doubt that nothing is cooler than a volcano! Volcanologists are scientists who study volcanoes. Learn about this fascinating STEAM...

Hundreds of years ago, the Inka Empire was the largest on Earth. The Inka were great builders, and created roads that helped the empire run smoothly. The most impressive part of the Inka roads were the bridges that were...