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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.