Story 1 begins — Roman concrete’s durability mystery

2:57concrete. Have you ever been to Rome? >> I have not. I was just in Italy, but I did not get the chance to partake in the life of the Roman. Yeah, Rome is honestly one of my favorite cities that I've ever been to because the amount of history that's there and the continuous civilization, you know, it's it's been around for millennia now. And you can see buildings that are literally 2,000 years old that I can scarce believe they built 2,000 years ago. It's actually like pretty incredible. And all of that is because of something called Roman concrete. >> Okay. Um, there's been a breakthrough