that's richard rhodes. his book, the making the atomic bomb, that is very technical. that goes deep into yeah, if you want to know the science, it that's where you want to read. there are other ones that are more too, but they're boring. i mean, richard rhodes is is the one you want to get to read. wonderful. thank you. okay. so someone had asked really early on whether thought was the manhattan project more of an engineering rather a physics problem. well, that's an interesting question the challenge they encountered were more the engineering side. i mean, it's the easy answer. it's both. but the physics are in a way kind of easy once you unlock the o.s, they're replicable easily. it's then the engineering to get the bomb to actually work to create this chain reaction, to build the conventional explosions, to create an implosion or to fire a projectile so that the real is once they've unlocked the science in building the thing and figuring that out. so this is partly why oppenheimer thinks like six scientia can come up with the then we need engineers and technicians