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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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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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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.