I wrote about experiences doing educational outreach in jails a few years ago, originally intending to turn out a blog post. It turned out that I had more to say than I expected so it ended up as an article-length piece which has finally appeared in the Journal of Humanistic Mathematics.
As with the math circle resources I posted earlier, my hope is that this kind of thing can help people act on their interest in doing this sort of outreach. If that’s you, please check it out!