Today we're having a dive down a cross-lines rabbit-hole about the Birth of the Bomb. Nuclear physics was, in the 1930s, a particularly international field where monster intellects would visit each other's labs and share ideas about the nature of the very small. Otto Frisch, born in Austria and nephew of Lise "Element 109" Meitner, was working with Niels Bohr in Copenhagen. While visiting colleagues in Birmingham UK, WWII broke out and he had to continue his researches there. In March 1940, with Rudolf Peierls, another refugee, he worked out that even 1 kg of Uranium235 would be enough to start an explosive chain-reaction. Bohr continued to write his protégé letters and, as things [political and scientific] hotted up, resorted to telegrams - lots of them, chocka-full of ideas, some sound, some clearly bonkers.provided vital evidence for keeping the Manhattan Project on track.
Later, lesser, bureaucrats applied the pedestrian "Military Applications of Uranium Disintegration" to MAUD as a backronym. Years later it was revealed that Maud Ray was an English governess to the Bohr family who had returned to her native Kent at the start of the war.