Scientists studied ear muscles in people. Scientists played sounds. People listened. They used their ear muscles when they were trying to hear.
Photo Credit: ia_64/Getty Images
In the Know
Helping Planet Earth
Plastic is bad for the Earth. Find ways to use … read more
In the Know
Light Up the Night!
And it isn’t just neon that glows this way. Some … read more
In the Know
Protests Against Racism Across the United States
This picture is the place where George Floyd was killed. … read more