The joint occurrence of the five factors we have briefly analyzed explains the exceptional growth of technique. Never before had these factors coincided. They are, to summarize: (1) a very long technical maturation or incubation without decisive checks before the final flowering; (2) population growth; (3) a suitable economic milieu; (4) the almost complete plasticity of a society malleable and open to the propagation of technique; (5) a clear technical intention, which combines the other factors and directs them toward the pursuit of the technical objective. Some of these conditions had
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