If I had the money I'd fork WP. I'd take the 100,000 most important articles and get those vetted, corrected, written nicely, with better (and more consistent) open source graphics, and with multiple good quality cites.

It'd go on the line, and people would be able to suggest edits and that page would ask them to provide a citation.

This version would be suitable for children to use.

The ledes would be re-written to give an ELI5 intro to the topic for people with little to no knowledge of it.

There'd be torrent downloads of it, so people could run it locally offline.