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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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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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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.