Status records whether an engineered system is still actually operating. Wikipedia notes Hoover Dam "impounds Lake Mead" and remains "a major tourist attraction, with 7 million tourists a year," very much in active use today. This dimension separates systems still running from those retired or demolished.
Facts
Comparison
Main Engineering Branch Field Founding Era Status
Sources
1. Wikipedia: Engineering
WikipediaIntroduction, traditional disciplinesQuote, Introduction, traditional disciplines
The traditional disciplines of engineering are civil, mechanical, electrical, and chemical.
2. Wikipedia: Nuclear engineering
WikipediaHistory, 1951 first electricity-generating reactorQuote, History, 1951 first electricity-generating reactor
The first nuclear reactor to generate electricity was Experimental Breeder Reactor I (EBR-I), which did so near Arco, Idaho, in 1951 on December 20.
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