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That's why those phrases tend to be avoided when discussing the theory in modern discussions. They're meant to be a sort of handy condensement of the idea, but some take the phrase too literally for it to be of worth. As a great primer for people interested in how the theory works, I suggest reading Richard Dawkin's The Selfish Gene. It still holds up remarkably well even after all this time. It really walks you through the concepts involved.
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