Although he hasn't proposed a total replacement of human parts the hint is there, consider this: - the inevitable happens and technology has progressed to the

Although he hasn't proposed a total replacement of human parts the hint is there, consider this: - the inevitable happens and technology has progressed to the level where everything in one's body has been replaced by 'cyborg parts'. - You are now living past 500 years. - After 500 years your brain has a total revamp and replaced by chips, it is now more powerful and would only need replacements every x years. - eventually your total brain is replaced with new technology, ensuring all memories are kept etc. - In 1000 years there is nothing original in your body except some old 'data'. - Now that the 'original you' is totally replaced IMHO you have d i e d and a Cyborg took over your identity! As a corollary this Cyborg has now took over your consciousness also! One consolation would be that if these events materialize at some point the Cyborg would try to use some of your Lisp stored 'data' and suffer infinite recursion and die too! :)