We live in a world of labels. We trust some labels to be precise: We expect a 250 mg capsule to deliver 250 milligrams of medication, and our 2-liter soft drink bottle undoubtedly holds two liters.

Since the inception of hearing conservation regulations hatched in the 1970's, efforts to stop noise-induced hearing loss always have been tied to a lagging indicator – namely, audiometric testing. If ...

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