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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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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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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.