by Chris Lefkow Agence France Presse Washington, United States (AFP) — How have Rome’s ancient aqueducts and architectural marvels such as the Pantheon, which features the world’s largest unreinforced concrete dome, endured the test of time? Researchers at the Massachusetts Institute of Technology (MIT) and other institutions believe they have uncovered the mystery of the durability of the 2,000-year-old structures — self-healing concrete. The secret lies in an ingredient of the ancient concrete used by […]