There's a growing buzz around pink noise, brown noise, green noise and their theoretical effects on sleep, concentration and the relaxation response.
<p>EVANSTON, Ill. — You may have heard of white noise used to mask background sounds. Now, it has colorful competition.
 Sound engineers define it as having equal volume across all the frequencies audible to the human ear. It gets its name from white light, which contains all the visible color wavelengths.
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