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Unleaded: How Changing Our Gasoline Changed Everything Grosvenor House Publishing Limited including cylinder boringWhen leaded gasoline was first developed in the 1920s, medical experts were quick to warn of the public health catastrophes it would cause. Yet government regulators did not heed their advice, and for more than half a century, nearly all cars used leaded gasoline, which contributed to a nationwide epidemic of lead poisoning. By the 1970s, 99. 8% of American children had significantly elevated levels of lead in their blood. Unleaded tells the story of