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Modern Marvels S10 Ep57: More Doomsday TechWe examine more threats--both natural and manmade--that may endanger civilization; from the far reaches of space to tiny viruses, doomsday sources are many.

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Now PlayingModern Marvels S10 Ep57: More Doomsday TechWe examine more threats--both natural and manmade--that may endanger civilization; from the far reaches of space to tiny viruses, doomsday sources are many.0Modern Marvels: Earthmovers IIStories of those who believed in dreams and defied the commonplace with their extraordinary creations; covering some of the world's architectural and engineering structures, scientific inventions, and social wonders.