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
The Amazing World of Bats
Some bats live in caves. They sleep upside-down. These bats … read more
In the Know
Animals in Winter
Some animals cannot survive in cold weather. Butterflies migrate. They … read more
In the Know
The Family of Martin Luther King, Jr.
Here are Yolanda and Martin Luther, III playing ball. Martin … read more