I just read this link on roman architecture; they have discovered how to replicate this Eco-friendly well-maintainable cement from volcanic ash and lime juice in salt water. I paraphrase poorly.
I think this is very fascinating; I think a lot of health problems relate to being in societies cage.
I think our species is growing -- but being confined to these 8 feet ceilings (both in dreams and buildings). I think with this understanding of better technology we will be able to rebuild our cities to be better and faster than ever before... This seems like huge step towards that:)
Here's the link;)