In any case, whenever technical progress opened a new window into the surrounding world, I felt the urge to look through this window, hoping to see something unexpected.

On the basis of these investigations Allen and Rossi invented the "fast ionization chamber" which they patented after the war. RaLa experiments
In April 1944 the Manhattan project experienced a crisis when Emilio Segrè discovered that plutonium made in reactors would not work in a gun-type plutonium weapon like the "Thin Man" which was being developed in parallel with a uranium weapon the "Little Boy" that was dropped on Hiroshima. New York: McGraw-Hill.

During World War II Rossi played a pivotal role in the Manhattan Project. In Italy from 1930 to 1938 he made major contributions to cosmic ray and particle physics. Bruno Benedetto Rossi (April 13 1905 – November 21 1993) was a leading Italian experimental physicist.