Moonshine and Lunacy

I got an email from a reader yesterday asking for help in understanding a video that she'd seen, in which a citizen-scientist performs an experiment with a very surprising result: moonlight makes things colder! How could this be? To find out, I took a dive into the well-intentioned but deeply problematic world of Youtube science.The first thing that I discovered on this journey was that this experiment is a popular one, particularly among "Flat Earth" theorists. (I wish I were kidding about that...