All that was necessary was to use one’s imagination to see how it might have happened, and then check the evidence to see if it did happen that way. The final step is to check the evidence to make sure it could not have happened any other way.

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Quote text and notes from Wikiquote: Randall Garrett (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.