Mitochondrial Eve

Everyone knows the story about Adam and Eve and how really all humanity has come from this one man and woman. I really had no idea that there was a way that you could trace it to Eve through the mitochondria. When the genes are passed on from mother to child the mitochondrial DNA remains the same. This means that it could be traced back for ages and it could not change. This is how people today trace back their ancestors. It would be interesting to see how far back scientists could actually trace the DNA because you have to take into account mutations that could occur and probably have occurred in the DNA over so much time.