Along with the diminishing supply of metals used for currency, Chines scholars developed the new economic idea that held paper money as a means of payment and exchange, not as a value in itself. The issuing of paper currency in Song China was as much of a process as the invention of paper currency itself.
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Doppler radar takes measurements of winds in clouds in order to predict severe storms and tornadoes
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At least 802 prisoners tried to escape, 144 successfully, and on 7 October 1944 two Sonderkommando units, consisting of prisoners who staffed the gas chambers, launched an unsuccessful uprising.
about 20
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How would Europe benefit economically from greater unity? ... The formation of the European Union accelerated economic growth in Europe because trade barriers were reduced, allowing goods, workers, and capital to move freely according to market demands.
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The rail road brought several advantages to the north it helped get supplies to those who needed it it was also a way to transport soldiers
