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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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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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Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.