Adaptive mechanisms

Spot the difference. I've been playing this game all day, comparing last sem with this one. This sounds crazy, but the differences, I've realized, are rather stark. For instance, I used to really get sleepy and tired in most of my classes last sem, but there's something rather exciting about the classes I'm taking now. And then, I feel that I'm more receptive to the lessons, I write more notes, I smile a lot more. Is it my instructors? My classmates? Or is it my newly-evolved sleeping habits of six hours or so a day?

Living things do learn to adapt.