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
Black Lives Matter
Some people are treated unfairly because they are African American, … read more
In the Know
Ruby Bridges Goes to School
Ruby Bridges was six years old. She had a hard … read more
In the Know
Raindrops Keep Falling On My Head!
Heavy rain can make the puddles too big. The extra … read more