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 th

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!