Modern Marvels: This episode uses captured Nazi documents, expert commentary, combat and archival footage and the recollections of the soldiers who lived through D-Day to tell the story of the most extensive defensive edifice erected since the Great Wall. The video visits the now-quiet coastlines where the remnants of the massive network remain and details the different defenses and weapons that were supposed to make the European coast impregnable. Then, see how the Allied commanders plotted their attack and hear from the soldiers who were charged with making their strategies work. SIMULATORS have made training for many professions far safer, more effective and less expensive than it would be if the students were in command of the real thing. MODERN MARVELS traces the history of these "synthetic reality" devices back to the 1929 Link Pilot Trainer, an open cockpit mounted to a universal joint and activated by pipe organ bellows. From this inauspicious beginning, simulators have developed into extraordinarily sophisticated devices that can emulate entire tank battles, the passage of supertankers through narrow, storm-tossed straits, and landing jet airliners in dangerous conditions. Climb inside some of the multi-million dollar devices that offer an invaluable substitute for on-the-job training.

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Documentary, History