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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.
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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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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.