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
In the Know
A Bridge that Tells Time
Long ago, sundials were used to tell time. Now we use clocks. Sundials show … read more
In the Know
Using Measurement Tools
Bakers know how heavy the dough needs to be. They … read more
In the Know
Dr. Andrea Ghez and the Giant Black Hole
This picture shows the black hole. Do you see it? … read more