I wrote this blog post a while back about what my kid got out of Minecraft and how it helped with our history lessons. I've been meaning to write another one about all the stuff he's doing with it now. He builds mechanized contraptions with circuits, switches, pistons, levers, relays, repeating relays, etc. He's 6! Yes, it's a time suck. And it's more what you do with it that applies what you know, rather than teaching you a lot of stuff that you didn't already know. But it's a wonderful way to creatively apply and practice what you know.