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Dream Projects: Giant Clean-Air 'Bubbles' Would Create Urban Havens

Proposed bubble-like structures containing environmentally controlled air would offer urban havens in polluted cities.

Very Large Structure would be a self-contained city, equipped with treads to enable it to move to new locations.

Proposed Bering Strait Tunnel would link Asia to North America.

Hyperloop concept for low-pressure tube mass transit system proposed by Elon Musk.

space elevator will enable people and cargo to be transported to geostationary earth orbit far more efficiently and cheaply than rockets can

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