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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.