Asked by Anonymous

What are two inventions that made modern city life possible?

I know one of the inventions are skyscrapers but I am not certain of the answer to the other one.

Answers

Answered by Ms. Sue
Plumbing with sewage treatment plants is even more important than skyscrapers.

Also -- if you have skyscrapers, you must also have Otis's invention.

http://inventors.about.com/od/estartinventions/a/Elevator.htm

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