Empires and Exchanges in Eurasian Late Antiquity (PDF) offers an integrated picture of Rome, China, Iran, and the Steppes during a formative period of world history. In the half millennium between 250 and 750 CE, settled empires underwent deep structural changes, while various nomadic peoples of the steppes (Huns, Avars,
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The International System of Units, the SI, provides the basis for all measurements in science, economics, engineering, and society. The SI has been fundamentally revised in 2019. The new SI is a universal and highly stable unit system based on invariable constants of nature. Its implementation lies on quantum metrology
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