Tuesday, February 25, 2020 Text is available under the CC BY-SA 3.0 licence.

Hendrik Casimir (1909 – 2000)

Dutch physicist best known for his research on the two-fluid model of superconductors and the Casimir effect.
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Hendrik Casimir
For although it is certainly true that quantitative measurements are of great importance, it is a grave error to suppose that the whole of experimental physics can be brought under this heading. We can start measuring only when we know what to measure: qualitative observation has to precede quantitative measurement, and by making experimental arrangements for quantitative measurements we may even eliminate the possibility of new phenomena appearing.
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