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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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The human body produces and destroys 15 million blood cells every second.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Green tea is able to stop the scent of garlic or onion from causing bad breath.