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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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The familiar sounds of your heart are made by the heart's valves as they open and close.