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What's Stopping Us from Building Cities in Space? No, It's Not Tech.

The US has a plan for Americans to live in space. In 2012, the National Research Council was commissioned by Congress to roadmap the future of human space exploration. Last June, the team published its findings in a massive report, which called for several action steps to be taken immediately. One year later, are we… » 6/18/15 2:40pm 6/18/15 2:40pm