On their journey to understand how cell phones work, the StoryBots talk to a microphone. She speaks about her role in the creation of a cell phone.

The StoryBots learn more about how sound recognition sends signals to the brain. Ears receive sound waves and have to interpret them to understand what is going on around us.

This clip explains the difference between sounds and music.

Beakman explains what sound waves and vibration are and explains how these create music. He then goes on to show that the human vocal chords create music due to changing sound vibrations.

Chuck Yeager finally breaks the sound barrier while piloting an aircraft. The people on the ground initially believe that the sonic boom was Chuck crashing but soon realize that Chuck was successful in his attempt to break the sound barrier.