Gravity's Role in Making Stars. When a clump of interstellar gas and dust is small and dense enough, gravity plays a decisive role in turning that material into a new star.
Line graph, not positive though
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The subjects of a conquered kingdom are not used to living in freedom or standing up for themselves, and are therefore slower to take up arms than are the citizens of a republic. There are three options for the conquering prince: destroy the republic, live there, or set up a puppet government. At the end of the day, Machiavelli seems to favor the first option.