All kinds of wonderful things flowed from the invention of the printing press in the fifteenth century: mass literacy, the spread of reliable knowledge, the end of the Catholic Church’s monopoly on information. But those same things also contributed to new divisions, to polarization and political change. The new technology made it possible for ordinary people to read the Bible, a change that helped inspire the Protestant Reformation—and, in turn, many decades of bloody religious wars. Martyrs were hanged, churches and villages sacked in a furious, righteous maelstrom that subsided only with
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