Then, they all stop. It’s so dark. You can’t see anything! But if you wait a few seconds …
In the Know
Special Money
The United States Mint makes the money we use. The … read more
In the Know
Bats Use Sound to “See”
Bats and other animals, such as whales, use echolocation to … read more
In the Know
Can You Hear the Stars?
Wanda Díaz-Merced is an astronomer. But she does not see the stars. She … read more