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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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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.