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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.