If you throw a ball up in the air, it comes back down. Gravity brings the ball down. Gravity is a force that pulls things to Earth. Gravity affects all objects.
Photo Credit: Jose Luis Pelaez Inc/Blend Images
In the Know
What Can Mummies Teach Us?
You might have seen mummies in movies. You might have … read more
In the Know
Mammals Cool Themselves in Unique Ways
Humans are mammals. Humans sweat when their bodies get hot. … read more
In the Know
A Bridge that Tells Time
Look at this bridge! This bridge helps people cross a river. It … read more