IN THE LATE 1940s, a graduate student at the University of Chicago named Clair Patterson(who was, first name notwithstanding, an Iowa farm boy by origin) 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 contaminated—usually wildly so. Most contained something like twohundred times 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 inventornamed Thomas Midgley, Jr.

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