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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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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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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.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.