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The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Adults in late adulthood may need to adapt to a new environment as they age and their health status Adults in late adulthood may need to adapt to a new environment as they age and their health status
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