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Did you know?
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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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