In this episode we look at two very different discoveries. First, a doctor and an ecologist both find themselves asking the same question: Is there something in the wildfire smoke? This question will bring them together, and reveal—to all of us—a world we never saw before. Then, we consider a series of studies that are reshaping our understanding of when and how we can learn. And what that could mean for things like PTSD, brain disease, or strokes.