Naturally, there's got to be a limit for I don't expect to live forever, but I do intend to hang on as long as possible.
Isaac AsimovThe Three Theorems of Psychohistorical Quantitivity: The population under scrutiny is oblivious to the existence of the science of Psychohistory. The time periods dealt with are in the region of 3 generations. The population must be in the billions (±75 billions) for a statistical probability to have a psychohistorical validity.
Isaac AsimovThere is no belief, however foolish, that will not gather its faithful adherents who will defend it to the death.
Isaac Asimov