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Author Question: What have researchers found about the relationship between physical fitness and stress? A) ... (Read 16 times) |
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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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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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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The human body produces and destroys 15 million blood cells every second.