Aristotle’s approach to the appropriate form of scientific explanationinvites reflection upon a troubling epistemological question: how doesdemonstration begin? If we are to lay out demonstrations such that theless well known is inferred by means of deduction from the betterknown, then unless we reach rock-bottom, we will evidently be forcedeither to continue ever backwards towards the increasingly betterknown, which seems implausibly endless, or lapse into some form ofcircularity, which seems undesirable. The alternative seems to bepermanent ignorance. Aristotle contends:


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