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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 average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.