It's not only aircraft that break the sound barrier.

SOUND
When all you can hear is the sound of your own body, extreme quiet is less peaceful than you'd think.
Your ears aren't the only thing you have to worry about.
When Bruce Willis is too busy to re-record own breathing, they call in the professionals.
A new study finds that babies can distinguish between sounds better if they can move their tongue.
Imagine a bunch of crocodiles inhaling balloons! (That's not quite what happened, but we can dream.)
Think you have perfect hearing? There are still plenty of sounds in the world that you can’t detect.
Was that mysterious "bloop" in the ocean made by a whale? Or by something much more mysterious? Investigators still don't know.
When you speak, vibrations from your vocal cords resonate in your throat and mouth, and some get transmitted and conducted by the bones in your neck and head. The inner ear responds to these just like any other vibrations, turning them into electrical sig