I can never satisfy myself until I can make a mechanical model of a thing. If I can make a mechanical model, I can understand it. As long as I cannot make a mechanical model all the way through I cannot understand.
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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 β¦ βΆ
- Heavier-than-air flying machines are impossible.
- Do not imagine that mathematics is hard and crabbed, and repulsive to common sense. It is merely the etherealization of common sense. β¨ Life of Lord Kelvin. Book by Silvanus Phillips Thompson, 1910.
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