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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Green tea is able to stop the scent of garlic or onion from causing bad breath.
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The human body produces and destroys 15 million blood cells every second.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.