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> The extra neutrons are perhaps so speeded up by the heat that they cease to be efficient atom-busters. Thus the reaction poohs out as the temperature rises.

One can wonder, was it disinformation or just that they didn't know good neutron reflectors which could be used for making viable bombs?

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Allied scientists discovered that highly pure graphite could be used as a neutron moderator, I’m not sure of the timing compared to this article. Fortunately the German scientists never figured this out, and continued to attempt to use heavy water, never succeeding partially due to Allied sabotage in Norway. Heavy Water Wars is a great TV series about the sabotage!

The Heroes of Telemark is even better! Kirk Douglas and Richard Harris, what could be better?

It was completely true in all respects. Natural uranium requires a moderator.

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