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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.