DANIELLE HANCHARICK, NORCROSS, GEORGIA: Hello, my name is Danielle Hancharick, and I'm from Norcross, Georgia. I wanted to ask CNN why you see lightning before you hear thunder.</s>ELLEN PRAEGER, UNIVERSITY OF MIAMI: Because light travels faster than sound. So even if lightning and thunder were to happen almost simultaneously, you would see the lightning before you would hear the thunder because of the speed of light versus sound.
Ask CNN: Why Do You See Lightning Before You Hear Thunder?