This (fact-based news) has been at the back of my mind for a long time.

If you stick with it and it ends up working out, this could be the start of something really interesting.

What are your plans to monetize? It seems that the NPR model works somewhat, but maybe there are other ways.

I worry that the market for nonsensationalized news might be small, but again, you have NPR as an example, so at least there's a niche. Worst case, this could probably work as a hobby, facts are useful in that once you put them on your site, they don't have to be updated much.

Good luck.

Edit: minor point: sources could be clickable.