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Author Question: A stagnant pond has an odor like ammonia. This is a good indication that the BOD of the pond is ... (Read 34 times) |
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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 Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.
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The horizontal fraction bar was introduced by the Arabs.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.