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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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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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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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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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