 It was really just a correlation. This is just sort of a basic question, but how well-researched is menstruation? You know, it's something that roughly 50% of the population does in their lives at some point, but how much do scientists really know about it? I'm so glad you brought this up. And it's interesting because a few years ago, our study team just looked up the search term of menstruation in the PubMed database.