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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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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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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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