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When using noise-canceling headphones, the unwanted sounds are canceled out by creating an opposing sound wave to the one you want to eliminate.
It means that when one sound wave is at its highest peak, the other is at its lowest, canceling each other out.
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One theory is that white noise helps to drown out other bothersome sounds. Another is that listening to the same sound each night may help people to associate it with falling asleep.
Studies show that although there is evidence that people fall asleep sooner, the quality of the evi...
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