Some sounds are excruciating. take fingernails squeaking on a chalkboard. The noise makes many people shudder, but researchers never knew exactly why. A new study finds that there are two factors at work: the knowledge of where the sound is coming from and the unfortunate design of our ear canals.
Previous research found that the painful parts of unpleasant sounds appear to be in the middle range of audible frequencies. But scientists didn
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