I'm sick of identifying as non stem oriented and I'd like to get a general grounding in a few areas, purely for interest sake. Just wondering if anyone has recommendations on where to start and with what?

I'm particularly interested in math, physics and chemistry at the moment. I would have a year 8/9 level understanding of each. Is khan academy ideal? I probably do better with books than computers if anyone has ideas. I'd really like to inspire my kids to view learning as fun so this is my first step!