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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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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People about to have surgery must tell their health care providers about all supplements they take.
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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.