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Did you know?
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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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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There are 20 feet of blood vessels in each square inch of human skin.