Where do you draw the line then ?

Do you consider a human being with a mechanical heart to be alive ?

What if his whole body is mechanical except his brain ?

What if parts of his brain are mechanical ?

What if his whole brain is mechanical ?

I think you are on a slippery road...

In fact the thruth might be that we are all just organic robots.

I also wonder if our "conciousness" / "humanness" is learned from generation 
to generation and not necessarily inside the human brain/dna. Evidence of 
this is in children who grew up between animals... they remained behaving 
like animals for the rest of their lives... (They lacked other "concious" 
human beings around them to "program" them with "conciousness" ;) :))

Bye,
  Skybuck.