Andi Diehn

"A lever is one of six simple machines that are designed to make different kinds of work easier. Lifting, pulling, pushing--all these tasks are more efficient when you use a simple machine. In Levers Lessen the Load: Simple Machines for Kids, readers learn how levers and fulcrums can help us move far more weight than we can on our own. Need to lift a heavy rock? Use a lever! Need to push a log out of the way? Use a lever! Know where else you can find...

"How do you keep a door from closing? Try using a wedge! Wedges are one of the six simple machines that help make work easier by using mechanical advantage. In Wedges Make a Point: Simple Machines for Kids, readers ages 5 to 8 learn how a wedge's shape makes it perfect at stopping something heavy from moving, and separating material to split something--like banana bread--apart. Glossary, photos, and a hands-on activity make this book fundamental for...