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

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.

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