[PJ-Comix]

Asimov figured out during WWII that there was a secret atomic bomb project going on because he noticed that all references in the news and in the library periodical guides to the subject of atomic energy suddenly vanished shortly after the war began.

[Samwise]

Interesting. Was it Heinlein who worked on the Manhattan Project? I know one of the sci fi greats did. Seems to me like he verified the rumor. But I'm not sure.

[denydenydeny]

Asimov and Heinlein worked together at the Philadelphia Navy Yard during WW2. It's easier to tie them to the Philadelphia Experiment than to the Manhattan Project.