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There are 60,000 miles of blood vessels in every adult human.
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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.