4th Grade

On July 20, 1969, Neil Armstrong made history by becoming the first man to ever walk on the moon! Readers will be engaged from cover to cover as they learn about Armstrong's inspirational career as an astronaut in this...

This inspiring Spanish-translated biography allows readers to learn about the incredible life of Sojourner Truth. Featuring a timeline of Sojourner's life, a glossary, and an index working in conjunction with vibrant...

Thomas Jefferson was a great American who helped the United States win its freedom from England. Jefferson helped write the Declaration of Independence, later went on to become the third president of the United States,...

In this inspiring Spanish-translated biography, readers will learn about the life of Wilma Rudolph, the first American woman to win three gold medals at one Olympics. Readers will feel engaged and inspired as they read...

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...

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...

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...

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...

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...

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...

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...