@amazeifystore: The light said "closed," but it was lying. 💡 At Three Mile Island, a fatal flaw in instrumentation logic changed history. The indicator monitored the electrical signal, not the physical valve. While operators managed one reality, the mechanical truth was completely different. Never trust a proxy measurement. How do you verify the truth when your sensors only see the command? Share your thoughts below! 👇 #ThreeMileIsland #Engineering #DataScience #History #NuclearPower #TechFailures #CriticalThinking #SystemsDesign #EngineeringLife #SafetyFirst #LessonsLearned