Because they had no system of their own to impose upon their subjects, they were willing to adopt and combine systems from everywhere. Without deep cultural preferences in these areas, the Mongols implemented pragmatic rather than ideological solutions. They searched for what worked best; and when they found it, they spread it to other countries. They did not have to worry whether their astronomy agreed with the precepts of the Bible, that their standards of writing followed the classical principles taught by the mandarins of China, or that Muslim imams disapproved of their printing and
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