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Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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There are 60,000 miles of blood vessels in every adult human.
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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.