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The paper explains it more as an experimental process than a manufacturing process. Each granule of hiroshimaite captures a "unique" micro-environment. One could imagine an ethical version of this involving conventional explosives in a controlled environment containing a variety of metallic samples of different compositions.
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Metals refining in space or a no atmosphere place like the moon. If an alloy is discovered that has properties we want I can see some future civilization popping nukes like pellets to produce it.
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Using conventional explosives is a real thing that exists: https://en.wikipedia.org/wiki/Explosion_welding
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You can probably skip the town in the ingredient list.
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There were some nuclear fracking experiments where the nukes cost in the range of a few hundred thousand dollars. It's probably cheaper than you think.
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The real expense is in rebuilding the city every cycle
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It might be a bit tough getting the permits from the EPA.
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Call it the Cheeto in Charge Manufacturing Center and you'll get a fastpass
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Well it appears to be the cheapest method known to produce at least some metal alloys.
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It's a real blast, though.

(In all seriousness, I hope we never, ever in this lifetime cause humans to suffer like we did on that day)

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I mean, I'm probably just being contrarian and I too would appreciate it if people stopped suffering, but like, people are suffering worse than that right now as we type this.
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Sure.

70,000 dying in a flash certainly puts an end to their suffering.

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They did not get vaporized in the fireball. We have survivors at the hypocenter. Intense burns and radiation poisoning killed most plus conventional blast damage mechanisms. Half the acute deaths happened after the first day.
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