All because of this small design error.īeing design experts in software development, we tend to focus on improvements: how to make the design more emotional, how to improve conversions through better visual language, how to optimize user experience so people would want to get back to the app. The release of radioactive krypton-85 and xenon-135 made 140,000 people within a 20-mile zone surrounding the plant evacuate. Because the light reporting about the valve’s status was malfunctioning, the plant operator figured out the issue when almost half of the uranium had already melted. People standing in front of Three Mile Island Nuclear Generating System on April 2, 1979.
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