documents that pertain to the case, especially documents that have not surfaced before, oppenheimer and trevalier. some thing in the book that you just saw. i'll update the author's notes as time goes on. but that's the brotherhood of the bomb. thank you. [ applause ] questions? yeah. >> what was frank oppenheimer doing at the -- he was there, wasn't he? >> the question was what was frank oppenheimer doing at the trinity test. frank was -- had been at oak ridge. he worked with lawrence on the calutrons. but he was invited by his brother to come to los alamos in late '44, if i recall. the thing about that is frank didn't have much of a role at los alamos. he was anenit at the trinity tower, where he wrote sort of the dos and don'ts -- don't carry hammers up into the tower, that sort of thing. a menial role for somebody who was an accomplished physicist. speculation at the lab was that robert had frank there so he could keep an eye on him. >> frank said that his brother never said anything about the bomb -- >> yeah. actually, i interviewed frank oppenheimer in 1983 at los alamos. one of the questio