I have no satisfaction in formulas unless I feel their numerical magnitude.

At what time does the dissipation of energy begin?

Questions of personal priority, however interesting they may be to the persons concerned, sink into insignificance in the prospect of any gain of deeper insight into the secrets of nature.

Heavier-than-air flying machines are impossible.

There cannot be a greater mistake than that of looking superciliously upon practical applications of science. The life and soul of science is its practical application.

Vortices of pure energy can exist and, if my theories are right, can compose the bodily form of an intelligent species.

All of science can be divided into physics and stamp-collecting.