Armentrout, David

Explains scientific concepts related to wheels, covering such topics as friction, bearings, and wheel size, and presents hands-on activities.

Explains scientific concepts related to wedges, discussing different jobs that wedges do, and presents hands-on activities.

Explains scientific concepts related to screws, discussing different jobs that screws do, and presents hands-on activities.

Explains scientific concepts related to levers, covering such topics as force arm and weight arm, and presents hands-on activities.

Defines inclined planes, explains their functions, and suggests simple experiments to demonstrate how they work.

The perfect introduction to being a pet owner for the child ready to get a bunny.

A biography of the famous English nurse who served in the Crimean War.