While taking a staff quiz just for practice, I was stymied to answer question 1. I couldn't find very many references to gentoo-core. This is when I noticed that the list in question wasn't identified on the lists.xml page Reproducible: Always Actual Results: The list isn't documented Expected Results: The list would be documented as "Private list, for internal gentoo use only"
You haven't looked hard enough. There's a fair amount of stuff on that list written in the developer relations documents, as well as infrastructure. Keep searching; you can even grep our documentation's CVS tree to find all the references to it. Because it's a private, internal list, it will not be documented on the "public lists" page.