How did you teach analog electronics to your kids?
Or how did you learn as a child? Age 9-ish?
I don't have any kids but if I ever do, I'd get them one of those spring and wire based 30 In 1/etc kits. That's how I fell in love with electronics.
haven’t done it, but I’d try a rain sensor. and if the child is into music, a guitar tone knob.