Thomas Midgley Jr.

Clair Cameron Patterson and the exact Age of the Earth

Clair Cameron Patterson and the exact Age of the Earth

On June 2, 1922, American geochemist Clair Cameron Patterson was born. Patterson developed the uranium–lead dating method into lead–lead dating and, by using lead isotopic data from the Canyon Diablo meteorite, he calculated an age for the Earth of 4.55 billion years; a figure far more accurate than those that existed at the time and one that has remained largely unchanged since 1956. Youth and Education Clair Patterson was born in Mitchellville,…
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Thomas Midgley Jr. and the Development of Leaded Fuel

Thomas Midgley Jr. and the Development of Leaded Fuel

On May 18, 1889, American mechanical engineer and chemist Thomas Midgley Jr. was born. Midgley was a key figure in a team of chemists, led by Charles F. Kettering, that developed the tetraethyllead (TEL) additive to gasoline as well as some of the first chlorofluorocarbons (CFCs). Over the course of his career, Midgley was granted over a hundred patents. Thomas Midgley Jr. grew up in Columbus, Ohio, and graduated from Cornell University…
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