A Rainbow of Noise

Everybody knows about white noise -- that sound that comes out of your TV when it's not working quite right. But there are many other colors of noise, too: pink, brown, blue, and purple. Marnie Chesterton brings us this story on the colorful science of sound. Play with your own noisy rainbow — and learn more about each color — by clicking here: Inside the Episode: We meet Shelley, who uses pink noise to drown out the constant ringing in her head (tinnitus); Professor Trevor Cox at the Acous...