http://www.techquark.com/2011/09/insight-sound-technology-its-future.html
- Sound waves are created by vibrations.
- Vibrations come from objects that create sound.
- The vibration of the object hits your ear drum that makes it vibrate to create the sound that you can hear.
- Some sound you can't hear, because your ear doesn't adapt to the sound as well.
Click okay for a sound that only kids can hear... not adults
A.B