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by delecti 1668 days ago
> Those were intelligently chosen projects; many more were no doubt rejected

It's comparatively easy to say that with hindsight. There was about as much reason in 1940 to predict that making a nuclear bomb was feasible with enough resources as there is today to think the same about fusion power generation. Both started from the standpoint of "theoretically possible, but levels and levels of unknown engineering challenges."
2 comments
leephillips 1668 days ago
There is a fundamental difference between the two—a difference that meant we knew we could probably build a fission bomb, and, later, fission reactors, but that controlled fusion is and will always be impractical. Nuclear fusion happens spontaneously in nature. The problem is keeping it from happening, and controlling the process. During the Manhattan project there were tragic events were fisson happened accidentally. Fusion is different because you must actively maintain conditions that nature is trying to disrupt.
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unsung 1668 days ago
> Nuclear fusion happens spontaneously in nature.

True, but you mean fission :)

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leephillips 1668 days ago
Dang it. Yes, I did. Thank you.
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wolverine876 1668 days ago
> It's comparatively easy to say that with hindsight.

Yes, and I omitted an essential factor: All the funded projects that failed and are mostly forgotten.

> There was about as much reason in 1940 to predict that making a nuclear bomb was feasible with enough resources as there is today to think the same about fusion power generation.

My impression is that it was believed to be a very likely project, and mostly a race with the Nazis. An excerpt from Einstein's letter to FDR, credited with kicking off the project:

In the course of the last four months it has been made probable—through the work of Joliot in France as well as Fermi and Szilard in America—that it may become possible to set up a nuclear chain reaction in a large mass of uranium by which vast amounts of power and large quantities of new radium-like elements would be generated. Now it appears almost certain that this could be achieved in the immediate future.

This phenomenon would also lead to the construction of bombs, and it is conceivable—though much less certain—that extremely powerful bombs of a new type may thus be constructed.

https://www.atomicheritage.org/key-documents/einstein-szilar...

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