Your the same dude who asked the Mesopitamean question too aren't you. Well, the wheel benefits us in ZILLIONS of ways these days. Cars, trains, machines, buses, toys, carriages, etc. Almost anything...
The ferris wheel was built to rival France's Eiffel Tower in 1893. It was displayed at the World's Columbian Exposition. Members of the planning committee wanted something, "original, daring, and...
I'd say it's a tossup between the automobile and the Internet. The revolver and railroads are somewhere up there too.
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Railroads are not the "invention", but the "steam engine" greatly...