| This is a question I have thought about and asked of friends.
 I don't have an answer other than to say that I know what it feels like to be human.  Having originally been human (ie born from the genetic code of two other organic humans), I am human.
 
 If you were to replace everything with machinery would I still be human?  It would depend on the efficiency of the machinery.  If it was able to keep my experience and "self" intact to a state that I wouldn't know the difference, I would  argue that I am still human.
 
 The question is would others react to me as such.  Given the current levels of prejudice I would argue that other "natural humans" would discriminate.
 
 I think the point at which that discrimination would end would be if I had an organic brain.  I believe we humans are (will be) brain-centric.  If you don't have soft tissue for a brain, you will not be considered human (though I suspect that computers could be just as efficient, at some point in time, to work as well as an organic brain).
 
				__________________"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
 - Old Man Luedecke
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