When sound waves reach your ear, you know you've heard a soft sound or a loud sound. via @HearingResearch http://t.co/b6h0xvL3LR
via VAT ENGPlus Combo | VATPlus | MotionTrak http://t.co/b6h0xvL3LR
via VAT ENGPlus Combo | VATPlus | MotionTrak http://t.co/b6h0xvL3LR
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