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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Thyroid conditions may make getting pregnant impossible.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.