
Lenses help us see. Lenses help us learn.
Look at this tiny animal. It is in a drop of pond water. We can use a microscope to see it. What do you see?
What Can You Do? How can you use lenses?
Photo Credit: Peter Parks/NHPA/Photoshot
When the air quality is unhealthy, being outside can make … read more
Summer is here! The weather is warm. Here are some … read more
What is the Bill of Rights? Why is it important? … read more
© 2026 McGraw-Hill Education. All Rights Reserved.