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I'm highly skeptical - at best - of this article, but the problem isn't with thermodynamics, it with the complexity of the system. We could keep a car running forever, barring a catastrophic accident, replacing one part at a time as it wore out. It just ceases to be economical to do so. We just don't know enough about the human body, and while nanotech has great promise, the more grandiose claims are a long way away, if they are even possible.
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