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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.
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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.