Marsico, Katie

In ancient times, people exchanged goods for other goods or services. However, bartering frequently grew complicated. People began using currency, or money, to put a value on a product. Learn about the history of money, why it has value, and the importance of managing your money.

Simple text and illustrations provide an introduction to the Earth, discussing its orbit, seasons and more.

Simple text and photographs introduce honey bees, discussing their physical characteristics, habitat, diet, and more.

An introduction to scorpions.

Presents a short biography of the inventor Lewis Howard Latimer.

Presents information on simple machines with a focus on wheels and axles. Explains what wheels and axles are, how wheels and axles work, and includes examples of uses.

Text and pictures introduce the wedge, a simple machine used primarily to split objects.

Text and pictures introduce the screw, a simple machine used as a ramp, to lock things together, and more.

Text and pictures introduce the inclined plane, a simple machine consisting of a slanted surface or ramp to make work easier.

"Albert Einstein used thought experiments to solve some of the universe's greatest mysteries. Learn how Einstein and his imagination helped us understand the nature of space and time"--Provided by publisher.