text:  So for some of these other cancers where the risk factors are less clear, we have a very hard time understanding what their causes may be. And so we're really early in our understanding of these causative issues. Yeah, this is such a mystery, right? Because first of all, there's the challenge in teasing apart causation when it could be multimodal, right? And then, as you're saying, a lot of it is just nearly impossible to measure, right?