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On the surface of a sphere , the shortest distance is along a segment of a great circle passing through the points . You may respond to stress in ways that can increase your risk of a heart attack . A heart attack can occur anytime — at work or play , while you're resting , or while you're in motion . So , recovering a function successfully from a given set of values generally requires assumptions about the nature of the functions involved in any particular signal-processing application . The doctor may use a cerebral angiogram to search for a possible cerebral aneurysm . In the latter case , the nested polygons typically change shape , and the bugs fail to meet simultaneously at some central spot .