I think one of the reasons we aren’t asking these questions much anymore is largely because of the school system itself and how utterly unnatural it is. I’m glad you brought up being a kid because kids are naturally inquisitive because they haven’t been corrupted much yet by the school system and their terrible methodology for teaching. It extinguishes the natural desire to question when you are told what you need to know and going outside of those bounds is largely not possible because it’s “not in the curriculum” they have to force to you by the time you graduate. As we get older it bears down on us more until we usually largely stop.

Hopefully you can un-learn those unnatural ways from school and regain your curiosity! That’s actually a big movement in modern times called unschooling!