“Lub-dub…lub-dub…lub-dub…” That’s the sound a healthy heart makes as its valves close after each pump. Your doctor wants to ...
Choose the right earplugs or earmuffs: Buy earplugs or earmuffs with a Noise Reduction Rating of at least 22 decibels. This number, listed on the product package, tells you how much sound the product ...
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