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Cells are probably just as ideal nanomachines as birds are ideal flying machines. Yes, quite nicely optimized to do what they do, but for our purposes 787s, F-22s and S-92s are much more useful.

>787s, F-22s and S-92s are much more useful.

Well, we can say that we're using them. Whether systems that consume thousands of years of fossilized sunlight remain beneficial to society in the long term remains to be seen. Personally I think our systems should be steady-state instead of depletionary.

Just because we're doing it doesn't mean it's ideal.

Considering how much fighters cost we could renewably synthesize fuel for them just fine.

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