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Author Question: An particle is also known as A) an electron. B) a positron. C) a helium nucleus. D) a ... (Read 102 times) |
In 1864, the first barbiturate (barbituric acid) was synthesized.
About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
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.
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.