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Every experiment destroys some of the knowledge of the system which was obtained by previous experiments.
--
"Critique of the Physical Concepts of the Corpuscular Theory" in The Physical Principles of the Quantum Theory (1930) as translated by Carl Eckhart and Frank C. Hoyt, p. 20; also in "The Uncertainty Principle" in The World of Mathematics : A Small Library of the Literature of Mathematics (1956) by James Roy Newman, p. 1051

 

Werner Heisenberg

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Two features of QT are commonly taken to be fundamentally non-classical: the absolute randomness of single events in the atomic regime, and the need for a permanent record of the experiment obtained using a macroscopic experimental arrangement…QT can also be applied to the larger system consisting of the original atomic system plus the macroscopic experimental arrangement. In this case, however, the larger system needs to interact with another stage of macroscopic recording. Since this procedure can continue ad infinitum, and is decisively terminated only when the result of an experiment is interpreted by a conscious observer, some noted quantum theorists have promoted the view that the quantum theory has some nexus with the consciousness of the observer...

 

Ravi Gomatam

 

In science, conjecture drives both experiment and theory for it is only by forming conjectures (hypotheses) that we can make the direction of our experiments and theories informed. If such and such is true, then I should be able to do this experiment and look for this particular result or I should be able to find this theoretical formulation. Conversely, experiment and theory drive conjecture. One makes a startling observation or has a sudden insight and begins to speculate on its significance and implications and to draw possible conclusions (conjecture).

 

Robert Curl

 

Modern experimentation is often like driving an automobile. The details and theory of the instruments being used in the experiment are not known to the experimenter except in a very general way. (...) Experimenters are taught in an explicit way, often, how to write up reports of their experiments. But the tradition here is like sports reporting. Only the results of the experiment are reported in any serious detail. The procedures are not.

 

Patrick Suppes

 

I would say, on the basis of having observe a thousand people in the experiment and having my own intuition shaped and informed by these experiments, that if a system of death camps were set up in the United States of the sort we had seen in Nazi Germany, one would find sufficient personnel for those camps in any medium-sized American town.

 

Stanley Milgram

 

One's tendency when one is young is to do experiments just to see what will happen, without really looking for specific things at all. I first set up a little laboratory in the attic at home just to grow crystals or try experiments described in books, such as adding a lot of concentrated sulfuric acid to the blood from a nosebleed which precipitates hemotin from the hemoglobin in the blood. That was quite a nice experiment. I still remember it.

 

Dorothy Hodgkin