More fun facts: almost nobody worked directly on the bomb. Thousands of people worked on manufacturing equipment and components and had no idea what they were supposed to be building. They split the project up into very granular pieces so that nobody really had full insight into what was going on except for the core group of scientists. (Source for this I believe is Feynman himself in Surely You're Joking)
Gladys Owens, the woman seated in the foreground, did not know what she had been involved with until seeing this photo in a public tour of the facility fifty years later.
