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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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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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There are more nerve cells in one human brain than there are stars in the Milky Way.