# Ancient Technology theoraclenode Jul 28, 2026 Roman Concrete Can Heal Its Own Cracks. We Are Just Rediscovering How. Some Roman concrete has survived for two thousand years. One reason may be that what looked like sloppy mixing was actually part of the technology.
# Ancient Technology theoraclenode Jul 28, 2026 The 2,000-Year-Old Machine That Should Not Feel This Modern Recovered from a shipwreck as lumps of corroded bronze, the Antikythera mechanism turned out to be an astronomical computer built before the Roman Empire reached its height.