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— Lord Kelvin"When you can measure what you are speaking about, and express it in numbers, you know something about it."
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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 measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind.
— Lord Kelvin
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Is it not demonstrated that a true flying machine, self-raising, self-sustaining, self-propelling, is physically impossible?
— Joseph LeConte
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