The other morning, I was walking my cocker spaniel, Fred, in our usual midweek spot along the river, when I noticed something. The sky was that really sharp, almost electric blue — the kind you only get on certain days. The fields were intensely green against it. And I felt different. Not dramatically. Not euphoric. Just lighter. Clearer. Calmer. It made me wonder why that combination affects me so strongly. It turns out, there’s real science behind it. Why Nature Has Such a