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I heard that it's the blood flow to the brain thing, that is a deciding factor on whether someone is alive or not... Although I can understand someone being mostly brain-dead and therefore unaware of it's own self-existence. Though I'm not sure whether the two ideas work together or not. Some parts of the body can die while other parts live on. So, I guess the question may most likely be, "What is the deciding body part(s) that must die, for the whole body to be considered as 'dead'?" But we should also ask "Can that particular body part be revived from a point considered as 'dead'?" Which would ask the question, "Is anything really 'dead' until no sign of what was 'alive' is completely wiped off the face of the Universe?" And, further still, you may want to ask if you were able to create a clone of a person, such that a soul could re-enter a living body, and continue it's life. Yet further still, what if you could clone a person, not using an original part of a body, but through some sort of Biological Engineering? Where you would, literally create new life, by building the DNA and other necessary building blocks needed to make a living person. (A pretty far out concept...) 
"There is no negative one..."
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