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Smithsonian magazine article on Roman concrete. It’s a lot more interesting than it sounds!

The Secrets of Ancient Rome’s Buildings | History & Archaeology | Smithsonian Magazine:

The Romans started making concrete more than 2,000 years ago, but it wasn’t quite like today’s concrete. They had a different formula, which resulted in a substance that was not as strong as the modern product. Yet structures like the Pantheon and the Colosseum have survived for centuries, often with little to no maintenance. Geologists, archaeologists and engineers are studying the properties of ancient Roman concrete to solve the mystery of its longevity.

(Via Smithsonian Magazine.)