The whole "amazing roman concrete" speel is kind of ridiculous: https://ascconline.org/Portals/0/Technical-Article-Aug-2017_WebSC.pdf?ver=2017-08-16-144954-857

The whole "amazing roman concrete" speel is kind of ridiculous: https://ascconline.org/Portals/0/Technical-Article-Aug-2017_WebSC.pdf?ver=2017-08-16-144954-857 https://ascconline.org/Portals/0/Technical-Article-Aug-2017_... I wouldn't be surprised if many of those 500/1000 year old wooden houses are like the ship of Theseus. How much of those buildings has been replaced or repaired over that time period? Same thing with brick houses. When they are repointed every few decades, how many of the bricks are swapped out when they crack or crumble?