OK, then get your search engine out: - "Tacoma Narrows bridge failure" - "Roman concrete" - "Millenium bridge London" - "Concrete cancer" - "Gabions" - "3,2,1

OK, then get your search engine out: - "Tacoma Narrows bridge failure" - "Roman concrete" - "Millenium bridge London" - "Concrete cancer" - "Gabions" - "3,2,1 concrete mix" The last two are useful for DIY. That lot is just concrete. Geotechnics and hydrology are also fascinating. When I studied this stuff we had a class where we grabbed some time to use the Poly's (Polytechnic - a bit like a second tier University back in the day - UK) electron microscope. I over focussed on our sample and vapourised it! We were studying "concrete cancer" which is a bit of a problem in maritime towns because salt in the air is one of the components needed. I went to Plymouth (Devon, UK) Poly, which is famously a sea town and so we saw a lot of conc cancer, eg the Drake Circus multi story car park. When you're done with concrete cancer then why not investigate how a building in Florida can collapse - ie this horror: https://www.bbc.co.uk/news/world-us-canada-57631698 https://www.bbc.co.uk/news/world-us-canada-57631698 Cheers Jon