The extraordinary properties of Roman concrete have generally been attributed to its mix of volcanic ash and lime. When combined with water, the two ingredients react to produce an incredibly strong material that stands the test of time. But that, as it turns out, is not the whole story. Read more: https://www.sciencealert.com/we-finally-know-why-ancient-roman-concrete-lasts-thousands-of-years Image credit: Marius Igas/Getty Images #ScienceNews #STEM #ScienceAlert #Physics #AncientRome | Science