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The ability to create and sustain large, complex organizations is one of the key factors that distinguish successful societies from unsuccessful ones.
The Liskov Substitution Principle is a fundamental concept in object-oriented programming, stating that objects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program.
You can say so much with pictures that you don't need to say in words.
History taught us is that people never know learn the lessons of history.