"At eleven I was at the peak of my creative powers: I was writing stories and playlets, putting together poetryprojects. I was absorbed by my 'work.' At twelve I was no longer reading or writing, just counting off days and checking them off. I was interested in survival."

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I now want to tell three stories about advances in twentieth-century physics. A curious fact emerges in these tales: time and again physicists have been guided by their sense of beauty not only in developing new theories but even in judging the validity of physical theories once they are developed. Simplicity is part of what I mean by beauty, but it is a simplicity of ideas, not simplicity of a mechanical sort that can be measured by counting equations or symbols.

— Steven Weinberg