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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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 oral chemotherapy drug for colon cancer was approved by FDA in 2001.