Type classification sorts health milestones by the kind of achievement each one represents, such as an eradication, a discovery or a new treatment. Wikipedia notes that smallpox eradication made it "the only human disease to have been eradicated" until rinderpest followed in 2011. This dimension lets a visitor compare milestones that share the same kind of achievement.
Facts
Comparison
Era of EmergenceSourced to the subject's own account Policy Milestone
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Sources
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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