Jiho loves all kinds of sounds. Every morning, he hears the birds sing in the big tree. One day, he asked his dad, "Where does a sound come from?"
Dad put a small drum on the table and put some rice on top. Jiho hit the drum with his hand, and the rice jumped up and down. "The drum shakes very fast," said Dad. "This fast shaking is called a vibration, and it makes a sound."
Next, Jiho put his hand on his neck and sang a song. He felt a little buzz under his hand. Dad said, "Your voice is made by a vibration, too."
Then Dad hit the drum very hard, and it made a loud sound. He tapped the drum with one finger, and it made a soft sound.
Sound moves through the air like a wave. It goes into your ear, and then you can hear it. That night, Jiho listened to the rain on the roof and smiled.