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Author Question: A fluid commonly used in cryogenic freezing is liquid _____. a. HCFC-22 b. nitrogen c. carbon ... (Read 50 times) |
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The average office desk has 400 times more bacteria on it than a toilet.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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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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The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.