SAGE Crossroads is printing an article that summarizes the current state of oxidative stress and free radical theories of aging. There are currently a number of competing theories of aging, all with some good looking science to back them up. It is seeming increasingly likely that a single unified theory of aging could be found to fit current theories into a seamless whole. A quote: "It's not that oxidative stress causes aging; it's a component of aging. We're moving away from the idea that there's a single cause of aging; there are probably multiple causes."