There are always problems to solve. Whenever we make something new, that gives us new things to deal with because of all the things we didn’t think of before we built it. For example, one of the biggest areas of engineering today is working out how to reduce environmental problems. Very often, when the products we use were invented, we didn’t know about the problems they might cause, such as global warming caused by the engines and fuels we use.
Even when nothing new happens, there are also plenty of problems to solve keeping things working properly, so a lot of engineers work in maintenance and overhaul, to keep products in service rather than spend a lot of money on replacing them.
As Michael has already said, there are always problems to solve, just some are more important than others, so they are the ones which tend to get worked on first. When I work with students, there are always problems which are less urgent, but it would still be nice to get the answer to them, so we set those for the students to practice on. It doesn’t really matter if they don’t come up with a solution, but it provides a good way for the students to learn using a real life problem. That way, they can progress on to more difficult problems and gain experience.
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