You may recall that scientists in Sweden recently provided hard proof for the mitochondrial theory of aging: "These findings strongly support the idea that mutations in mitochondrial DNA can cause at least some features of aging." This long article from Science News Online gives a good account of this research, the underlying science, and where we should expect follow-on research to go from here. "The mice engineered by Larsson and his colleagues should invigorate research into the processes of aging." More scientists are now thinking about how to better classify the effects of mitochondrial mutations, prevent them, or prevent the resulting damage. Good!