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I certainly agree that the definition of life is an interesting and difficult ethical question that becomes more complex as we learn more about the brain. I just wanted to add that, in my opinion, with people in a vegetative state, the question is not only whether they are still alive, but if it is possible for them to have a life that they would want to live. Many people hate the idea of living trapped inside their body, being able to think, but not to move or interact with others. I think allowing people to make their own decisions, beforehand, as in a living will, is a good idea.