To estimate how many doors are there in the world, we must first understand the different places where doors exist—and how varied those places are. Homes, office buildings, hospitals, cars, buses, stadiums, even elevators and lockers—doors are far more ubiquitous than most of us realize.Let’s take a logical, step-by-step approach to build a thoughtful global estimate.Residential Doors: The Most Common SourcePopulation...
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