> That sounds like a recent development. Reinforced concrete is almost two hundred years old by now [0]. How many people live in homes built over one hundred y

> That sounds like a recent development. Reinforced concrete is almost two hundred years old by now [0]. How many people live in homes built over one hundred years ago? Not only have many of those old homes been replaced, but the population is much larger now. [0] https://en.wikipedia.org/wiki/Reinforced_concrete#History https://en.wikipedia.org/wiki/Reinforced_concrete#History