There is a line on the Lightspeed submission page, talking about things that should go in a cover letter. It says something like, "and if your story is about black hole clusters, and that's what you wrote your doctoral dissertation on, tell us." My dissertation was totally not about black hole clusters.
Somehow, I managed to sell a story to Lightspeed anyway. I am so excited to tell you that "Sweet Sixteen" will be appearing there in the near future. It does not have black hole clusters in. I hope you will like it.