I've collected a bunch of interesting links over the past month, including this food for thought:
Birds Under Stress Become Better Singers
"A hostile environment and inconsistent weather may explain why some birds become better singers than others, and also likely have superior learning and mating skills, a study said Thursday."
Since I do believe in evolution as well as God, I have to wonder: does it work that way for people, too? Do I sound better now than a few years ago because of all the worrying? I think I fit the profile (although my mating skills could use some help). We already know that that suffering, kvetching, and losing sleep makes us great doctors and lawyers--but how cool if someone could prove that it gives us better voices, too.