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Back away from that speaker, turn down that iPod and put down that power tool unless you want the ringing in your ears to remain permanent. Sound can hurt you, and that ringing may be the first sign.
As you watch someone happily murder every song he belts out at the karaoke bar, you have to wonder whether it's caused by the growing bar tab, a total lack of embarrassment or simple tone deafness. Why do some of us hear music so differently?