[mjohnson]

Those neutrons will make all sorts of radioactive stuff when they hit something. Maybe eventually we'll cut the thing up and burn it in a fission reactor?

Wouldn't the neutrons' energy partly (the energy that's not doing further nuclear reactions) become heat as they're slowed and absorbed?

Even if they don't break even, there's some useful stuff we can use the machine for. That's hard for me to say out loud, sitting here in Los Alamos. We're almost required as a condition of employment to dis everything that happens in Livermore.