While it is not true that every 7 years all of the cells in our bodies have been replaced, cells in our bodies are being replaced all the time. How is it that so much of us of us remains steady and consistent? I guess one could argue that our brain cells lasting much of our life may contribute to this. Yet still, their connections are constantly changing. And I am not sure which is the bigger miracle, the change or the stability. I guess in order for this to happen, much c