Sonic Bubbles: Escaping noise, but at what cost?
Twenty Thousand Hertz
Sleepmate - The Sleepmate Is a Sound Conditioner
Jim Buckwalter came up with a device that could replicate the hum of an air conditioner, but without the air part. He and his wife were having trouble sleeping because there was a poker game going on in the next room. Their invention made this pleasant, wishing sound; all their friends wanted one. They wound up starting a business making these things.
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