Credited to names the person whose work made a health milestone possible. Wikipedia notes that "in 1796, Edward Jenner introduced the modern smallpox vaccine," nearly two centuries before the disease was finally declared eradicated. This dimension connects a milestone back to the individual most responsible for it.
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1. Wikipedia: Sanitation
WikipediaSanitation, History section, ancient RomeQuote, Sanitation, History section, ancient Rome
The first sewers of ancient Rome were built between 800 and 735 BCE.
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