Un encadenamiento de razonamientosválidos sólo puede llevar a la determinación de la verdad. - Isaac Asimov

To anyone who has been in space and experienced its changelessness, the real excitement of space flight comes when it is time to land on a new planet. The ground speeds backward under you as you catch glimpses of land and water, of geometrical areas and lines that might represent fields and roads. You become aware of the green of growing things, the gray of concrete, the brown of bare ground, the white of snow. Most of all, there is the excitement of populated conglomerates; cities which, on each world, have their own characteristic geometry and architectural variants.

And just how did you arrive at that remarkable conclusion, Mr. Mayor?

I shall not be alive a half decade hence," said Seldon, "and yet it is of overpowering concern to me. Call it idealism. Call it an identification of myself with that mystical generalization to which we refer by the term, 'man.