Today's show is about a problem people have been trying to solve for a hundred years: how can we mass produce houses, like we do cars? Listen for a house that looks like a UFO, a giant mobile home boom, and a visit to a 21st-century construction site where workers are putting up a factory-built house. This episode's a co-production with our friends at Planet Money, and a follow-up to last week's interview with the founder of Cover.

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