This is such a fascinating period of history. I remember reading an article about the Roman colosseum during this period and it blew my mind.

Meanwhile in Boston we filled in a shallow bay with garbage until it was just barely solid enough to build high rises on, and then decided to tunnel underneath the whole thing like a hundred years later. Actually it went pretty well all things considered.

I actually knew this fact already but reading it written as g/L instead of ppt just made me realize it's the same ratio of salt:water as my sourdough recipe!