Like why can’t we recreate a synthetic physical body or body part? Like robots have such a hard time walking by themselves without a constrained set of programming and environment? Or that even keeping a heart beating outside of the is hard to do without a big machine to do all the work?
The best way I can explain is like why can’t we recreate the muscles/ Body part very well? Or at least mimic them in terms of function?
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The two biggest obstacles are the miniature nature of a machine based replacement, and the fact they have to work reliably 24/7/365 for years at a time. We do have big machines that can temporarily replace many organs, but those are still short term solutions.
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