What specific things do engineers design, help to manufacture, build or help to operate and maintain?

Submitted by: Murtaza
Just look around you for the answers - cars, vans and trucks; roads, bridges and highways; trains, planes and buses; computers, cell phones and MP3 players; refrigerators, air conditioners and heating systems; etc. - the engineer's invisible hand" in present in almost everything that you and others use and depend upon each and every day. Plus a multitude of other thing that are not as obvious: medical instruments, fire engines, farming equipment, food processing plants, sports equipment, musical instruments and recording equipment - and the list goes on and on.
Submitted by: Murtaza

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