Grade 4

The high maneuverability and speed of jet fighters cause pilots to experience g-forces nine times that of gravity! Students will learn about the history, technology, and future of the fastest More →

Is that a leaf or an insect? Children won't believe their eyes when they see these tricky creatures. From katydids that look just like leaves to three-toed sloths that blend in with tree… More →

On July 26, 2003, mountain-climber Rod Liberal was nearing the summit of Grand Teton Mountain in Wyoming. As Rod clung to the side of a granite cliff, he saw dark clouds rolling toward him.… More →

Experience firsthand some of the world's most destructive disasters through the eyes of the people who survived them. Combining clear scientific explanations of the disasters with gripping… More →

How do katydids protect themselves from predators like birds, spiders, and snakes? These insects have wings that look just like leaves on a tree, helping them disappear into their… More →

Saint Bernards make good search and rescue dogs because of their strong sense of smell. They are famous for saving people trapped in Europe’s snowy Alps. Eager students will learn the history More →

F-35 Lightning IIs are U.S. Air Force strike fighters that battle enemy aircraft to control the skies. Readers will track F-35s on active missions and study the high-tech weaponry and… More →

In 2009, Larry Fitzgerald established himself as one of the NFL's best players when he led the Arizona Cardinals to their first-ever Super Bowl appearance. The hard work and passion Larry… More →

While almost all frogs begin their lives in the water, adult frogs make their homes in many different places. Some types of frogs remain in the water, while other kinds stay mostly on firm… More →

On June 25, 1997, a volcano on the Caribbean island of Montserrat erupted, spewing hot lava and ash. Linda Daley was washing clothes outside her home in the nearby city of Plymouth when she… More →

On December 29, 2007, a fierce blizzard hit Olympia National Park in Washington State. Cross-country skier Randy Kraxberger, traveling alone, was caught by himself in the severe winter storm. More →

On August 28, 2005, Trina Peters heard some alarming s—-Hurricane Katrina was headed straight for her hometown of Orleans, Louisiana. Though officials recommended evacuating the city, Trina… More →