Why do some people wear braces? How do braces work? Questions such as these are answered in this accessible text, which explains this ...
What is an axle, and how does it work with a wheel? Readers are introduced to this STEM concept through clear and accessible main text, ...
Batteries and bulbs are found in many household devices, such as radios, lamps, portable video games, and other everyday objects. How do ...
What kinds of everyday objects use levers? What do pulleys do? Questions such as these are answered in this age-appropriate text about the ...
Several different modes of transportation, such as trains, planes, and cars, need motors and gears to properly run. Motors and gears also ...
What are switches used for on specific machines? Why are circuits needed to power certain devices? Questions such as these are answered as ...
When a bell rings or a buzzer goes off, it often serves as a reminder to complete a certain task or directs our attention to something that ...
Readers take an exciting journey to the Indus Valley as they explore the ancient civilization that arose in this fascinating place. Through ...
Where was Mesopotamia located? What did ancient Mesopotamian society look like? What did the people who lived there do for fun? As readers ...
