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Originally Posted by KaiYeves
Is it also believeable that the extraterrestrial in my story could have something like nanobots in their blood to repair broken bones and the like quickly?
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How quickly, and what's the cost in energy and resources, and are there waste products (material and/or waste heat)?
I've seen quite a few stories that invoke nanobots but ignore conservation of mass and energy - so that, for example, somebody might grow twice their original size in five minutes, with no hint where the material or energy came from, or what happened to the inevitable waste heat. As far as I'm concerned, that's pure fantasy.
Now, if you have nanobots that give limited abilities with a significant cost, it might be different. Just remember there's a reason why people don't have quick-fix bones already.