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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
Medications that are definitely not safe to take when breastfeeding include radioactive drugs, antimetabolites, some cancer (chemotherapy) agents, bromocriptine, ergotamine, methotrexate, and cyclosporine.
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.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.