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Energy conservation and environmental protection

At first glance, the question seems simple Are there more doors or wheels? To begin to analyze this, we must first define what constitutes a door and what qualifies as a wheel. Doors can be found in homes, offices, vehicles, and public buildings. They serve as entrances, exits, and barriers for safety and privacy. A simple calculation of the number of doors in a typical house, for instance, can reveal that a modest home might have anywhere from a few to a dozen doors, including interior doors, exterior doors, and cupboard doors.