[W]e're learning more about our continuity with the rest of nature - in terms of the ecology, genetic make-up, evolutionary history. On this basis, it's easy to conclude that being "human" is overrated. [...]
We need to be always reminding ourselves that we have always been enhancing ourselves, that science has always been enhancing the human condition, that we have been trusting machines over our own bodies for at least 300-400 years now. We've already broken through that barrier - we do live in a very artificial world. Even though the stuff on the horizon may amplify our powers tremendously, it is nevertheless part of the same process. It is a step change but it's the same story, the story of scientific progress.
(Related: Humans, version 3.0.)