Grade 4

The polar bear is the largest meat-eater living on land. It has an appetite for seals, walruses, and whales, but it is not picky when starving. Come face-to-face with a hungry polar bear and… More →

Recon Marines are sent on high-risk knowledge quests. They travel inside enemy territory to gather intelligence for military leaders. With the top secret information they collect, the U.S.… More →

Animals with an appetite for hedgehogs must work hard for their dinner! They need a pain tolerance for sharp spines and the strength to pry tightly curled bodies. Get a feel for why hedgehogs More →

Everyone knows that mosquitoes are bloodsuckers. But did you know that some can cast the shadow of death with a bite? They spread malaria and life-threatening fevers through their saliva.… 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 →

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 →

Radar is of little use to the enemy when the F-35 Lightning II is in the air. From the shape of the aircraft to the paint that coats it, the F-35 is loaded with stealth features that make it… More →

Mountain climbing is about the challenge. It's about rising above difficulties to reach the breathtaking views that wait atop mountains. Let this book get you geared up for rock climbing,… More →

Don't touch the deathstalker scorpion! If it doesn't nab you with its pinschers, it will sting you with toxic venom from the end of its tail. Read about the deathstalker before you become its 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 →

With Earth a mere spec in the universe, there’s no telling what life forms exist beyond our blue and green planet. Are there hunter-gatherers with blue tinted skin, or armored warriors no… More →

Considered the most capable multi-role fighter, the F-16 Fighting Falcon can weather any storm. The streamlined aircraft will fly more than 500 miles to meet the enemy, locate targets under… More →