They are. :-)

I love reading about new scientific discoveries about how the body works. It's just so fascinating. I'm amazed by what has been learned about the brain in the last decade, for example, and figuring out how most hormonal feedback systems work is probably really just beginning. There are probably ones we don't even know about yet. (And I could go on and on about this. One of the things I really look forward to over the course of my lifetime is reading about this stuff.)