Dear Doctors: Our sound machine died, and my husband is shopping for a new one. It made sounds like rain and surf, which helped both of us sleep. The ads for some of the new machines talk about ...

Beyond light, noise also possesses a spectrum of colors, each with a unique frequency profile. These 'colors of noise,' like white, pink, and brown, a ...

May the best noise win. In a world of cacophony, it may be too much to ask for silence. Even that, as Simon and Garfunkel warned us, has sounds. So what do you do? Counteract sound with sound. Set a ...