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It is the simple hypotheses of which one must be most wary; because these are the ones that have the most chances of passing unnoticed.

"Thermodynamique: Leçons professées pendant le premier semestre 1888 - 1889". Preface to the book by Henri Poincare, 1892.
It is the simple hypotheses of which one must be most wary; because these are the ones that have the most chances of passing unnoticed.