Rudolf Emil Kalman

“Whenever a model is built, it is always proper to ponder the basic scientific question: is the model really based on the data or is an artifact displaying the prejudices of its creator?” Rudolf Emil Kalman, Kyoto Prize address

William John Macquorn Rankine

“A hypothetical theory is necessary, as a preliminary step, to reduce the expression of the phenomena to simplicity and order before it is possible to make any progress in framing an abstractive theory,” William John Macquorn Rankine Outlines of the Science of Energetics, in Proceedings of the Philosophical Society of Glasgow (1855)