I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science, whatever the matter may be.
William Thomson, Lord Kelvin (1824-1907) Scottish physicist
“Electrical Units of Measurement,” lecture (3 May 1883)
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