thought fit only for slaves, as in the classical Græco-Roman world, the experimental method does not thrive. Science requires us to be freed of gross superstition and gross injustice both. Often, superstition and injustice are imposed by the same ecclesiastical and secular authorities, working hand in glove. It is no surprise that political revolutions, skepticism about religion, and the rise of science might go together. Liberation from superstition is a necessary but not a sufficient condition for science. At the same time, it is undeniable that central figures in the transition from
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