Here's perhaps a scarier (or, depending on how you look at it, more hopeful) thought: as this technology combines with other emerging technology - nanotechnology, biotechnology, information technology - will there come a point at which individuals, by virtue of 'personal area networks' of bionanobots ambient in their bodies and interfaced with the mind can control their own DNA, and its expression? And if this point is reached, what does that mean for the future of humanity? Clearly it might mean many things, but one of the most significant in my view is the end of speciation as we know it. If each individual is self-determining their genes, there will be no single successor species to humanity or indeed, any successor species as such. It could be an age of complete 'genetic freedom' so to speak. But we'd better be very sure we know what we're reading before we dare write.
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