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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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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.