The very foundation of science is to keep the door open to doubt.
Precisely because we keep questioning everything, especially our own premises,
we are always ready to improve our knowledge. Therefore, a good scientist is
never ‘certain’. Lack of certainty is precisely what makes conclusions more
reliable than the conclusions of those who are certain: because the good
scientist will be ready to shift to a different point of view if better
elements of evidence or novel arguments emerge. Therefore, certainty is not
only something of no use, but is in fact damaging, if we value reliability.
- Carlo Rovelli, Theoretical Physicist
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