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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.