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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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Your heart beats over 36 million times a year.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.