A fitting analogy is one which likens the history of the engine to a steamroller, gathering momentum slowly and steadily to reach peak performance in the last hundred or so years. In a broad sense, engines have populated this reality for a much longer time than human consciousness can comprehend, the lineage traceable back to single celled entities that once called the oceans home. In this broadest sense, the engine is understood as anything that converts a particular form of force into another form of force.

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