1.   Doctors see a lot of people with headaches and backaches, sometimes the result of overbooked lives and a lifetime of accumulated unbalanced stress.

2.   Earthquakes occur when the rocks finally give way, releasing accumulated stress.

3.   The Astros are reasonably certain the torn rotator cuff was suffered on the play at second base, and not the result of accumulated stress on the shoulder.

4.   And part was accumulated stress from a cargo ship collision and frequent computer breakdowns and power outages.