When you see something that is technically sweet, you go ahead and do it and you argue about what to do about it only after you have had your technical success. That is the way it was with the atomic bomb.
In the material sciences these are and have been, and are most surely likely to continue to be heroic days.
In some sort of crude sense, which no vulgarity, no humor, no overstatement can quite extinguish, the physicists have known sin; and this is a knowledge which they cannot lose.
There are children playing in the streets who could solve some of my top problems in physics, because they have modes of sensory perception that I lost long ago.