Rather than demand practical explanations, we should take advantage of the opportunity to learn.
We should want to learn.
Once when tutoring with a fellow tutor (who was earning his MA in Pure Math) a student protested that geometry was worthless. We then proceeded to point out the building we were in, the doorways we walked through, the tables we sat at, and the chairs we sat on were possible because of geometry. I think it’s safe to say, though, that the issue wasn't geometry. As a teacher and tutor, I have seen plenty of exacerbated students who wanted to give up but didn’t. I believe the problem was that the student wasn’t interested in learning.
Without a desire to improve, our learning will likely remain superficial: we may know important facts and details and figures, but only be able to reproduce them. Without continued learning our knowledge will become trivia, relics of an antiquated past as new theories, proofs, concepts, and technologies pass us by.
Somehow we've gained this perspective that learning takes place in classrooms with our noses in textbooks and filling in worksheets, as if the rest of our lives are something we're being barred from until we've completed the arduous task of education. We plow through classes we need for the sake of a piece of paper with shiny lettering.
I don't mean to say earning a degree isn't important: it's a testament to your formalized education, the specialized work that qualifies and shows you are capable in a specialized field, but it should not stop there. It should never stop there.
If you're in college, and don't have a desire to learn, you should either get out of college or find that desire. Why study something if you don't have a desire to be knowledgeable of it? Why spend years of your life and thousands of dollars to foster something you don’t have a desire for. I think we've forgotten that learning can be a pleasurable experience. Rather than shutting ourselves up in our fields of study or perceiving education as a temporary need, never to be revisited once the diploma is obtained, we should approach education with joy and enthusiasm and continue seeking it even after the tassels change sides.
This is fine and well for your own discipline, but what about general education courses? I've had students going into the sciences and engineering who consider their composition and humanities courses to be a waste of their time. And, in a melancholy way, I agree with them. Not because the humanities are useless for the sciences and engineering, but because it’s self defeating: if you don't think you'll get anything out of course, you won't. On the contrary: my advice would be to approach every opportunity to learn with excitement and not get so preoccupied with how you'll use it in the future.
If you don't value what you learn, you'll discard it, and whatever personal, powerful contribution it could make later on will be lost. Don't go into your world culture or survey of jazz class and bemoan the wasted time and money when you could be studying core classes towards your chemistry degree. I can't tell you what you'll learn, because learning is deeply personal. What I can tell you is if you perceive it as wasted, then it will be. So don't waste a powerful opportunity to become a more informed, capable, and happy person.
As for my students, I don't expect them to become English majors and study literature, nor do I expect them to devote their lives to research in their disciplines. But I do hope they will see their education as a joy and an opportunity, so when I assign them research projects and as they choose their majors they will pursue something they want to know and learn.