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[Henry Ford's] ignorance was a frequent source of wonder. He believed that the earth could not support the weight placed on it by skyscrapers and that eventually cities would collapse in on themselves, as in some kind of biblical apocalypse. Engineers explained to him that a large skyscraper typically weighed about sixty thousand tons while the rock and earth excavated for the foundations would weight more like a hundred thousand tons, so that skyscrapers actually reduced the burden on the earth beneath them, but Ford was unpersuaded. He seldom let facts or logic challenge the certainty of his instincts.