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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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Cyanide works by making the human body unable to use oxygen.
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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.