Would something perennial like Requests for Reopen & Undeletion Votes, etc. (volume 10/2012 - 12/2014) help? Example:
♦ $\sqrt{x}$$\sqrt{x}$ = $x$ but $\sqrt{x^2}$ = $|x|$. Why?,
♦ What's the thing with $\sqrt{-1} = i$,
♦ Why is $\sqrt{4} = 2$ and Not $\pm 2$?,
and their many duplicates under "Related" (sufficiently multitudinous that I record only these 3).
Posterior to the comments and downvotes, I've added "homogeneous" to the title to define this thread for coalescing very allied questions and answers, such as duplicates, and not merely all those which are related. I tender some candidates in my answer below.
I reference When, and how, to suggest merging of questions?,
questions asked over 100 times, Merging two identical questions with accepted answers