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.
Social Studies (Ms. Sue) - Ms. Sue, Wednesday, May 22, 2013 at 12:08pm
Plumbing with sewage treatment plants is even more important than skyscrapers.
Also -- if you have skyscrapers, you must also have Otis's invention.