I noticed that there is an answer deleted by an author here.
It's a brief answer that points to a resource, provides sufficient context, and at least one commenter found useful.
I'd like to undelete it, or repost the resource (perhaps with slightly different contextual support) but ti was deleted by the author. Presumably, it was deleted because some of the suggestions came under challenge. That's only a guess.
I think both the answer and the criticism are appropriate. I think challenging ideas in mathematics is an important part of mathematics education in specific (and STEM education in general). However, I wonder what thoughts or policies there might be about reinstating a deleted answer.
As an alternative, I prepared a new answer with the same resource, but I'd rather reinstate the deleted one because it's gotten 8 votes and the author deserves those votes for providing a decent resource that addresses the question.