Finally, some have an ethical concern about equity and inequality. A common challenge to these predictions about longevity is that only the wealthy will be able to afford the technologies of radical life extension. My response is to point out the history of the cell phone. You indeed had to be wealthy to have a mobile phone as recently as thirty years ago, and that device did not work very well. Today there are billions of phones, and they do a lot more than just make phone calls. They are now memory extenders that let us access almost all of human knowledge. Such technologies start out being
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