The passage from an AIP oral history interview with Robert Furman reads: Furman: We were taught that matter and energy were one, all the same — in somewhat greater detail than that. That kind teaching was not in the old texts. So this to Groves was a big secret. He kept a physics book in his safe and he lent it to me. But I always had to put it back in the safe. He didn't realize that I had physics books at home. Regardless, I had to bone up on physics so that I could talk to the scientists that I was working with. I was being instructed by Dr. Vannevar Bush. The scientists were asked to educate me. Dr. Richard Tolman, for instance, took me out in a sailboat from Woods Hole Massachusetts, and when we got far from shore, he looked all around and began educating me in the science behind the nuclear bomb project.
https://files.mastodon.social/media_attachments/files/112/038/416/990/801/707/original/2e9020d8e4c68844.jpeg