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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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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There are more bacteria in your mouth than there are people in the world.
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There are 60,000 miles of blood vessels in every adult human.
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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.