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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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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.