"Natural phenomena undisturbed by man point the way to the realization of a new technique. One needs a keen sense of observation. We must understand Nature before we can adapt its way of working to our needs."

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It is one thing to say that science is only equipped to test for natural causes and cannot speak to any others. It is quite another to insist that science proves that no other causes could possibly exist. . . . There would be no experimental model for testing the statement: 'No supernatural cause for any natural phenomenon is possible.' It is therefore a philosophical presupposition and not a scientific finding.

— Timothy Keller