Roman Engineers. Why doesn't anyone ever speak of African engineers? 🤣
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It turns out they were adding extra lime (IIRC) and so when water got into a crack, it would react with the lime and form more concrete.
Ingenious, really. The only way you could figure out the right ratios of that stuff is to do a large number of experiments and carefully document the results using tools that could give repeatable observations. Very high tech stuff, the sort of stuff that modern science is built on.
Our ancestors were GENIUS!
My ancestors come from England, who were smart in their own way.
We totally had ways of dealing with "zero" as a concept. We knew that there were certain problems that arise logically, such as "all unicorns (which none exist) are both purple and blue". We treated zero as the special case it was. You couldn't divide by it, so why should it be a number?
I've always laughed at the propaganda that zero didn't exist until the muslims took over the centers of Western scholarly research during their initial invasions. 0.00000253131 is a fraction. Fractions do not require a zero, just a lot of hand writing to express the fraction. One can figure this out with a tape measurer.