What innovative ingredient did ancient Romans add to their concrete that modern scientists believe contributed to its extraordinary durability in seawater?

The Roman Empire's architectural legacy continues to fascinate historians and engineers alike. One of their most revolutionary products was their unique concrete formula, which has survived for millennia in structures like the Pantheon and Colosseum. This remarkable building material represents one of history's greatest product innovations, combining volcanic ash (pozzolana) with lime and seawater to create structures that have withstood time, earthquakes, and the elements for over 2,000 years. Test your knowledge about this incredible ancient product!

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