For me, most of my life I always wondered why we see the Milky Way across our sky as a band or strip when we keep being told it's a spiral galaxy. I only recently realized that we see it from side.
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I see that the 3rd dimension and spacial relativity have eluded you for quite some time
it's not something I learned from reddit, but until about a few months ago, I didn't realize that a town or city could have more than 1 high school and middle school in it. I literally wondered how people in new York and other cities for to school0