Are there fundamental big questions in physics that most scientists encounter no matter what they're working on, or are most questions details of smaller subtopics? What are the great unknowns of our day?
Sorry in advance if my question is too general. I told my kid that there are some things science still doesn't have theories for, and she asked "like what" and I said I wasn't sure, so I'm asking here. So much science has been done since I was in school that I don't know what all has changed. I think what she's after is some real mysteries to wonder about, ones that don't have generally accepted theories yet.