> I see no reason to believe that a replacement really is as good as getting the original part to work properly. It's certainly possible: http://www.engadget.

> I see no reason to believe that a replacement really is as good as getting the original part to work properly. It's certainly possible: http://www.engadget.com/2008/01/17/prosthetic-limbed-runner-disqualified-from-olympics/ http://www.engadget.com/2008/01/17/prosthetic-limbed-runner-... These legs allow him to run more efficiently than his original legs would have. http://www.npr.org/2011/06/13/137029208/heart-with-no-beat-offers-hope-of-new-lease-on-life http://www.npr.org/2011/06/13/137029208/heart-with-no-beat-o... The relevant quote is: "'These pumps don't wear out,' he says. 'We haven't pumped one to failure to date.'" The same can not be said of the human heart. The rest of your argument is from lack of imagination.