They have several examples of this on the Wikipedia page, but this one struck me when I saw it some years ago: https://en.wikipedia.org/wiki/Manhattan_Project#

They have several examples of this on the Wikipedia page, but this one struck me when I saw it some years ago: https://en.wikipedia.org/wiki/Manhattan_Project#/media/File:Y12_Calutron_Operators.jpg https://en.wikipedia.org/wiki/Manhattan_Project#/media/File:... 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.