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``In almost all circumstances, and at all times,
we find ourselves in a state of uncertainty.
Uncertainty in every sense.
Uncertainty about actual situations, past and present...
Uncertainty in foresight: this would not be eliminated
or diminished even if we accepted, in its most absolute form,
the principle of determinism; in any case, this is no longer
Uncertainty in the face of decisions: more than ever in this
Even in the field of tautology (i.e of what is true or
false by mere
definition, independently of any contingent
circumstances) we always
find ourselves in a state of uncertainty
of what is the seventh, or billionth, decimal
place of ...)...''
(Bruno de Finetti)