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And how many miles you get from harvested heart? 5 years? Maybe 10? Average, I think, is 6 years.

I mean this could be calculated with relative easy whether it is worth harvesting or not, but I see no difference between harvesting natural organs vs harvesting artificial parts

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If I had to guess I'd lean to thinking manufacturing an artificial muscle like the hearth is is a lot more challenging that an artificial joint like the knee is. Also from what I've seen people who get knee replacements tend to be people with a lot of years left to live to want to ski and run on them, whereas someone who needs a hearth transplant is probably nearing the end of their lifespan.

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