"He that borrows the aid of an equal understanding doubles his own; he that uses that of a superior elevates his own to the stature of that he contemplates."

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Now, the velocity of wave propagation can be seen, without the aid of any mathematical analysis, to depend on the elasticity of the medium and its density; for we can see that if a medium is highly elastic the disturbance would be propagated at a great speed.

— Albert A. Michelson