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How Loud is Too Loud? Video

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Scientists measure the loudness of sounds in units called "bells", named after the inventor of the telephone, Alexander Graham Bell. Talking softly is about 30 decibels. Speaking in a normal way is about 60 decibels. But an airplane, a boom box, or a rock concert can be 100 to 140 decibels, and that is loud enough to cause a permanent hearing loss.

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