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We Finally Know How Ancient Roman Concrete Was Able to Last Thousands of Years
(www.sciencealert.com)
This is a most excellent place for technology news and articles.
Every year we seem to get an article about how we've finally discovered how Romans had really good concrete, as if we've not already known for ages.
The issue has always been about logistics, cost, time to produce, etc — not because we had no idea how the Romans did it.
This plus extreme selection bias. There's plenty of concrete that did not last for thousands of years.
"They don't make things like they used to. See that tube radio over there? It's 75 years old and still working! A rare find!"
But in their defense, not a single thing on Earth made in the last decade has lasted 75 years. Check mate.