Dynamical variables are what count in physics, not coordinate or gauge transformations. - John Clive Ward

Almost all the serious achievements are simple in principle... the ideas must be sufficiently simple.

<math> (\left|x\right\rang \left|y\right\rang- \left|y\right\rang \left|x\right\rang) </math>... was my first lesson in quantum mechanics, and in a very real sense my last, since the rest is mere technique, which can be learnt from books.

One day I had the idea of radiation implosion. As in all ideas that have ever popped up in my head, there is no way I can trace the source.