Grade 3

Killer bees have the mob mentality. They attack in large groups and refuse to let up without a fight. A group of killer bees can remain wound up for up to 24 hours! Learn why you should never More →

If emotionless monotones are all that come to mind when you think of robots, it’s time to rewire your motherboard. Open this book and let the renegade robots within inspire you to build your… More →

With fossils as their only clues, scientists have created an image of life millions of years ago. Try your hand at a scene in the world of the dinosaurs with the help of this how-to-draw… More →

When it comes to lemurs, it's a woman's world. Females rule—they eat first, win all family arguments, and fight enemies on the front lines. Learn why you'd want to be “one of the ladies” in a More →

Sometimes actors don't have the skills they need for a movie scene. This is where stunt performers jump in, sometimes literally. These daredevils jump out of moving cars, off high cliffs, and More →

When kangaroos gather in large groups, they get loud and physical. Males duke it out in boxing matches, jumping and jabbing with feisty determination to earn the “dominant male” title. Be… More →

Two sections of Earth’s crust meet to form the Great Rift Valley in the middle of Ethiopia. Bordering the valley are some of Africa’s most expansive highland areas, lending Ethiopia the… More →

When United States infantry troops need support, a UH-60 Black Hawk prepares for liftoff. This utility helicopter can carry 11 fully equipped soldiers into battle and transport injured troops More →

For missions that need immediate attention, the B-2 stealth bomber takes to the runway. This flying wing can reach any target in the world in a matter of hours. The bomber’s flat frame is… More →

New Zealanders love to play, and their country is their playground. This South Pacific island comes equipped with snowy mountains for skiing, swift rivers for rafting, and deep valleys for… More →

Supporting Marines on the ground, the AH-1W Super Cobra performs a critical function for the United States Marine Corps. Loaded with weapons and capable of quick maneuvers, the Super Cobra is More →

The main gun on an M109A6 Paladin can fire up to four rounds every minute. Each round can travel up to 15 miles (24 kilometers). The Paladin has been the backbone of United States Army… More →