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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.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
There are more nerve cells in one human brain than there are stars in the Milky Way.
To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.