The McCarthy period came along...and many of the other scientists who had been working on these same lines gave up. Probably saying "Why should I sacrifice myself? I am a scientist, I am supposed to be working on scientific things, so I don't need to put myself at risk by talking about these possibilities." And I have said that perhaps I'm just stubborn... I have said "I don't like anybody to tell me what to do or to think, except Mrs. Pauling."