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.
Facts
Comparison
Era of Emergence Origin Year
Sources
1. Wikipedia: Safe Drinking Water Act
WikipediaSafe Drinking Water Act, lead sectionQuote, Safe Drinking Water Act, lead section
Signed into law by President Gerald Ford on December 16, 1974
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