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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.

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Blood is approximately twice as thick as water because of the cells and other components found in it.

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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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Women are 50% to 75% more likely than men to experience an adverse drug reaction.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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