A stop sign causes traffic to stop. We can cross the street safely because of stop signs.
Photo Credit: FatCamera/iStock/Getty Images
In the Know
Where on Earth Is Uganda?
There are many different groups of people in Uganda. They … read more
In the Know
Can Squirrels Plant Trees?
Eastern gray squirrels eat nuts and berries. They can find … read more
In the Know
Heroes in the Skies
The Tuskegee Airmen painted their planes’ tails red. People called them the … read more