There are no nations! There is only humanity. And if we don't come to understand that right soon, there will be no nations, because there will be no … - Isaac Asimov

Every period of human development has had its own particular type of human conflict — its own variety of problem that, apparently, could be settled only by force. And each time, frustratingly enough, force never really settled the problem. Instead, it persisted through a series of conflicts, then vanished of itself — what's the expression — ah, yes, 'not with a bang, but a whimper,' as the economic and social environment changed. And then, new problems, and a new series of wars.

Words are a pretty fuzzy substitute for mathematical equations.

Algunos Eternos han llegado más allá del Siglo Ciento cincuenta mil. — ¿Qué aspecto tiene? — Completamente distinto del actual. Hay muchas especies vivientes, pero ninguna humana. El Hombre ha desaparecido.