How the Ancient Romans Made Better Concrete Than We Do Now

If you've ever wondered why the ancient structures of Rome have endured for millennia, when our own modern concrete is susceptible to cracks and crumbles, well, now you have your answer. Researchers recreated the Roman recipe and discovered that the formation of a certain kind of crystal in the concrete is the reason… » 12/18/14 1:30am 12/18/14 1:30am