Neat site of oral histories of the Bomb project:
http://manhattanprojectvoices.org/oral-histories/rose-bethes-interview
That one linked above is with Rose Bethe, wife of Hans Bethe, physicist who ran the so-called Theoretical Division at Los Alamos (the other 3 divisions being Experimental Physics, Chemistry & Metallurgy, and Ordnance). In his career before and after Los Alamos, Bethe tossed off little bagatelles like figuring out how the sun works.