Futureproof Extra: What makes Roman concrete so duarble?

Think of those greatly-preserved Roman structures like the Pantheon and you might marvel that they are still standing after all these centuries. So what’s so special about this ancient construction that leaves us with these marvelous buildings? Linda Seymour, a former MIT doctoral student with a background in civil engineering – alongside researchers from MIT, Harvard, and labs in Switzerland and Italy – has been examining what made Roman concrete so durable - she joins Jonathan to discuss.