Sir Isaac Newton was the first person to study gravity. He was sitting under an apple tree. An apple fell from the tree and hit him on the head. He discovered that gravity made things fall to Earth.
Photo Credit: McGraw Hill
In the Know
Just Found: An ‘Extinct’ Clam That is Alive
The clams were found in California. They were found on … read more
In the Know
What Causes It to Happen?
A stop sign causes traffic to stop. We can cross … read more
In the Know
Mask Up!
A mask blocks the drops. It stops the virus from … read more