Carr, Aaron

Dump trucks haul piles of dirt and rocks in their boxes. The biggest dump trucks can carry more than 490 tons of rocks or dirt. Learn more about these machines in Dump Trucks.

Tractors use tools to do different jobs. A backhoe loader is a special kind of tractor with a bucket on the front and a scoop on the back. Learn more about these machines in Tractors.

Excavators are used to dig holes and lift heavy things. They use tracks to move along dirt roads. Learn more about these machines in Excavators.

Apatosaurus was one of the largest animals to live on land. This dinosaur had a neck more than 17 feet (5 meters) long. Readers learn this and more!.

Did you know that each golf club is different? Clubs with higher numbers hit balls higher into the air. Learn more about this beloved sport.

How long can it take a plant seed to sprout? What do plants use to make their food? Young readers will discover these facts and more.

Did you know that pro surfers still use moves from many years ago? People use surfboards to ride on top of waves. Learn more about this extreme sport.

Velociraptor was a small predatory dinosaur that had feathers. It is known for the long, sickle-shaped claw it had on each foot and for being one of the smartest dinosaurs that ever lived.

Jumbo jets move people and goods around the world. The biggest jumbo jet can carry more than 550,000 pounds of goods. Learn more about these machines in Jumbo Jets.

The name Stegosaurus means "roof lizard." It lived in grasslands near lakes and rivers, and it is best-known for having the smallest brain compared to its body size of all dinosaurs. Learn this and more in this book!.