Grimmie
Grimmie Grimmie
  • 14-05-2017
  • History
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How many years did it take the modern engineers to figure out how the roman concrete was made out of?

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PolarSanwhich9
PolarSanwhich9 PolarSanwhich9
  • 14-05-2017
Took engineers years to figure out that Ancient Romans used volcanic ash in a mortar with lime stone.
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