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There are 60,000 miles of blood vessels in every adult human.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.