We often think of our genes as a fixed script. Something that determines our future with no say in the matter. I’ve heard people say there’s no reason to test them, because “what’s the point, you can’t change your DNA.” But that’s not how it works. Genes like APOE are more like spotlights. They illuminate areas where we may need to pay closer attention. And when we know where to look, we can act early, and powerfully, to change the story.