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Asthma cases in Americans are about 75% higher today than they were in 1980.
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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.