Word: error
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...have a very small margin for error," Roby said. "We're small. We don't have a lot of depth...
Such mental fatigue can be as threatening as a heart attack. Recent evidence indicates that drowsiness is a leading cause of traffic fatalities and industrial mishaps. "Human error causes between 60% and 90% of all workplace accidents, depending on the type of job," observes biological psychologist David Dinges of the University of Pennsylvania. "And inadequate sleep is a major factor in human error, at least as important as drugs, alcohol and equipment failure." Other research suggests that sleep loss contributes to everything from drug abuse to poor grades in school...
...just screwed up," Fraiberg said. "I made unforced error after unforced error, kept hitting tins and made ridiculous shots. I was just beating myself out there. It had nothing to do with my opponent...
...achieve the exacting specifications for the mirror, Perkin-Elmer used an optics template, a tubular array of smaller mirrors and lenses linked by connecting rods, to guide the grinding and polishing processes. When the Allen committee tested this template assembly, it found that there was a critical error of 1.3 mm (0.05 in.) in the placement of the template's components. The Hubble mirror was carefully fashioned to match exactly this error in the template...
What was worse, the company's reliance on this system was absolute. Though backup analyses pointed to a major flaw in the mirror, stated the report, these "indicators of error were discounted at the time as being themselves flawed." The evidence of the problem was never analyzed in detail by the engineers and scientists most qualified to do so. NASA accepted Perkin-Elmer's decision to rely solely on the precision of the template, when instead the space agency should have been alert "to the fragility of the process and the possibility of gross error...