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There are 20 feet of blood vessels in each square inch of human skin.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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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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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%.