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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.