Text 1 A materials scientist argues that repeated stress usually causes a crack to begin at an existing microscopic defect rather than at an arbitrary point. Defects concentrate force, so early imaging should help predict where failure will start. Text 2 Metal samples were scanned before thousands of loading cycles. In most samples, the first visible crack later appeared at one of the small voids identified in the initial scan, and larger voids were associated with earlier cracking. What relationship between the texts is best supported by their discussion of microscopic defects and material fatigue?