Henri Poincare

To doubt everything, or, to believe everything, are two equally convenient solutions; both dispense with the necessity of reflection.

Mathematics is the art of giving the same name to different things.

Ideas rose in clouds; I felt them collide until pairs interlocked, so to speak, making a stable combination.

Why do men fight who were born to be brothers?

I feel sorry for generations of Labour voters and supporters who must look and wonder what on earth has gone wrong and what Labour is for.

Most technological advances in our life now come from serendipitous discoveries. That is a contraction of rocket technology and computer technology and atomic clock technology.