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Soon, you might be able to print a house almost as easily as printing your homework. The world’s first fully livable 3-D-printed home was recently unveiled by New Story, a San Francisco charity that will mass-produce the two-bedroom homes for people in poor countries. How do you print a house? Using a preloaded floor plan, the printer produces layers of concrete that keep their precise shape while hardening. Then, workers install windows, a wooden roof, plumbing, and wiring. (The company hopes to eventually develop robots and drones to produce and install these parts.) The process takes less than 24 hours and costs about $4,000—weeks faster and thousands cheaper than building a traditional house. New Story plans to print an entire village in El Salvador next year. Could printed homes solve the problem of homelessness across the globe? “That’s the plan,” says Brett Hagler, New Story’s CEO. “Our goal is to house the billion people in the world who need shelter.”