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The theory of punctuated equilibrium, proposed in 1972 by biologists Stephen Jay Gould and Niles Eldredge, holds that populations of living organisms tend to experience a significant amount of evolutionary change in short, stressful bursts of time. Gould and Eldredge argued that evolution isn’t a constant, gradual process—it occurs during episodes when species are in environments of high tension or especially crisis.
Read more of this article at The Economist