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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Your heart beats over 36 million times a year.
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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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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.