Grade 4

The Alcatraz Federal Penitentiary was a nearly escape-proof prison located on a small island in San Francisco Bay. America’s most dangerous criminals were imprisoned there and endured harsh… More →

For thousands of years, smallpox had been one of the world’s biggest killers. From the terrible plague that nearly wiped out the entire Aztec and Inca populations in the 1500s to the outbreak More →

Sticking out into the Mediterranean Sea, Italy has some of the nicest weather in Europe. It is famous for its art, architecture, and cuisine. Readers will discover the physical geography of… More →

Have you ever seen something in the sky that you could not identify? You wouldn’t be alone. Many people have reported seeing unidentified flying objects. Reports range from flying saucer… More →

Cottonmouths are named after the white color inside of their mouths. They open their mouths wide to threaten predators that get too close! Readers will discover where cottonmouths live, what… More →

America’s northern neighbor, Canada, is similar to the United States in many ways but also very different. Kids will learn about Canada’s diverse wildlife as well as some of its biggest… More →

Both water turtles and land turtles can be kept as pets. These unique creatures are not the most common pets, and it is best to try to re-create their natural environments as much as… More →

The Sea Dragon is the largest and heaviest helicopter in the United States military. It can transport troops and haul cargo. It is also used to detect and blow up mines in dangerous waters.… More →

What does it take to become a United States Marine? Kids will find out in this exciting look inside the U.S. Marine Corps' grueling, 13-week basic training program. Readers will learn all the More →

How did a flu outbreak in Kansas eventually lead to the deaths of an estimated 50 to 100 million people all over the world? Readers will find out in The Flu of 1918: Millions Dead… More →

China, with over one billion people, is the most populated country in the world. China’s most famous tourist attraction is the Great Wall, which runs across about 5,000 miles of northern… More →

Living in parts of the Eastern United States, copperheads are named after the orange-brown color of their bodies. Students will learn about the diet, habitats, and physical characteristics of More →