Natures wonders: Bird Migration
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Natures wonders: making spider silk (Introduction)
It would have to be from within. My point was that polymorphism doesn't mean that a subclass creates its own implementation of a method. That implementation still has to be 'written', as it were, by the programmer before it is implemented.
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What is the purpose of living? How about, 'to reduce needless suffering. It seems to me to be a worthy purpose.
