We all have in our minds short histories of how knowledge grew and a popular one is that there was a period of scientific and philosophical growth that began more than a couple of millennia ago with the ancient Greek, Arabic, and Chinese civilizations that slowed down sometime during the early second millennium where there were no real advances and indeed a regression with a loss of knowledge. That was then followed by the period we now call the Age of Enlightenment with its associated scientific revolution that began in the 17th century around the time of Galileo. Scholars of the much-maligned middle period that has come to be down as the Middle Ages (or more pejoratively the Dark Ages) take umbrage with characterizations that compare that period unfavorably with what existed before and what came after.
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