The ancient Romans weren’t just great at conquering lands—they were also engineering geniuses.  Their secret weapon?

The ancient Romans were masters of building and engineering, perhaps most famously represented by the aqueducts.

And those still functional marvels rely on a unique construction material: pozzolanic concrete, a spectacularly durable ...

For decades, researchers believed that pozzolanic concrete was made by mixing ... This reaction created a tough, water-resistant material. However, when analyzing samples of 2,000-year-old Roman ...