Related discussion from yesterday: Why was Roman concrete so durable? https://news.ycombinator.com/item?id=34280239 https://news.ycombinator.com/item?id=34280

Related discussion from yesterday: Why was Roman concrete so durable? https://news.ycombinator.com/item?id=34280239 https://news.ycombinator.com/item?id=34280239 (269 comments)