Origin year places a health practice in the year it was first adopted. Wikipedia records that after Semmelweis introduced hand washing in 1847, "the maternal mortality rate dropped from 18% to less than 2%" on his ward almost immediately. Browsing by origin year shows how long a practice a visitor takes for granted has actually been in use.
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Era of Emergence 20th century
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1. Wikipedia: Great Stink
WikipediaGreat Stink, Aftermath sectionQuote, Great Stink, Aftermath section
Work on high-, mid- and low-level systems for the new Northern and Southern Outfall Sewers started at the beginning of 1859 and lasted until 1875.
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