All science must start with some assumptions as to the ultimate analysis of the facts with which it deals. These assumptions are justified partly by … - Alfred North Whitehead

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All science must start with some assumptions as to the ultimate analysis of the facts with which it deals. These assumptions are justified partly by their adherence to the types of occurrence of which we are directly conscious, and partly by their success in representing the observed facts with a certain generality, devoid of ad hoc suppositions.