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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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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.

Zebras are several species of African equids (horse family) united by their distinctive black and wh Zebras are several species of African equids (horse family) united by their distinctive black and wh
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Video: Structure of a Ribosome

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