If you wish to strive for peace of soul, then believe; if you wish to
be a devotee of truth, then inquire.
 -- Friedrich Nietzsche
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The game of science is, in principle, without end. He who decides one
day that scientific statements do not call for any further test, and
that they can be regarded as finally verified, retires from the game.
 -- Sir Karl Popper _The Logic of Scientific Discovery_ §11
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[A] theory is falsifiable [(and therefore scientific) only] if the
class of its potential falsifiers is not empty.
 -- Sir Karl Popper _The Logic of Scientific Discovery_ §21
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I shall require that [a scientific system's] logical form shall be
such that it can be singled out, by means of empirical tests, in a
negative sense: it must be possible for an empirical scientific system
to be refuted by experience.
 -- Sir Karl Popper _Logic of Scientific Discovery_ §6
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He wore trifocals. There was stratigraphy even in his glasses.
 -- John McPhee _Annals of the Former World_ p364
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"Old hypotheses never really die, they're like dormant volcanoes."
 -- John McPhee _Annals of the Former World_ p313
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"While geologists argue, the rocks just sit there and sometimes they
seem to smile"
 -- John McPhee _Annals of the Former World_ p304
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[T]he question of whether Machines Can Think, [...] is about as
relevant as the question of whether Submarines Can Swim.
 -- Edsger W. Dijkstra "The threats to computing science"