The article hinted at, but did not further explore the unique properties of Roman concrete. https://en.wikipedia.org/wiki/Roman_concrete https://en.wikipedia.o

The article hinted at, but did not further explore the unique properties of Roman concrete. https://en.wikipedia.org/wiki/Roman_concrete https://en.wikipedia.org/wiki/Roman_concrete https://www.theguardian.com/science/2017/jul/04/why-roman-concrete-still-stands-strong-while-modern-version-decays https://www.theguardian.com/science/2017/jul/04/why-roman-co... http://www.popularmechanics.com/technology/infrastructure/news/a27186/ancient-roman-concrete-mixture-seawall/ http://www.popularmechanics.com/technology/infrastructure/ne...