I Often Say That When You Can Measure What You Are Speaking About, And Express It In Numbers, You Know Something About I

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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 ...
-- Lord Kelvin

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