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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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The horizontal fraction bar was introduced by the Arabs.