[randallsquared]

It seems interesting in itself, but perhaps gwern had an analogy with semiconductor progress, given yesterday's front-paging of the 5nm and 7nm goals.

[gwern]

Yes, that's one reason I bumped it up in my submission queue: nuclear bombs are an unusual area of engineering/science - a field which has basically perfected its craft as far a it will be permitted by the surrounding society, and is experienced that rarest of things, the endgame of a field.