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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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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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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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There are 20 feet of blood vessels in each square inch of human skin.