I came across this, but searching didn't unearth whether there was a cutdown kids version: https://www.kiwix.org/ https://www.kiwix.org/ I have considered jus

I came across this, but searching didn't unearth whether there was a cutdown kids version: https://www.kiwix.org/ https://www.kiwix.org/ I have considered just scraping/grabbing all the countries, planets, stars and maybe notable pre-modern people, and leaving him to gradually work through those for a bit.