IE 1940s, a graduate student at the Uy of Chied Clair Patterson(who was, first withstanding, an Iowa farm boy by in) was using a new methodof lead isotope measurement to try to get a definitive age for the Earth at last. Unfortunatelyall his samples came up inated—usually wildly so. Most tained something like twohuimes the levels of lead that would normally be expected to occur. Many years wouldpass before Patterson realized that the reason for this lay with a regrettable Ohio iorhomas Midgley, Jr.
Midgley was an engineer by training, and the world would no doubt have been a safer placeif he had stayed so. Instead, he developed an i in the industrial applications ofchemistry. In 1921, while w for the General Motors Research Corporation in Dayton,Ohio, he iigated a pound called tetraethyl lead (also known, fusingly, as leadtetraethyl), and discovered that it signifitly reduced the juddering dition known asengine knock.
Even though lead was widely known ……（内容加载失败！）
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