Show Notes for May 12, 2016

  • Lead
    • Clair Cameron Patterson (June 2, 1922 – December 5, 1995) "was an American geochemist. […] 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. […] Patterson had first encountered lead contamination in the late 1940s as a graduate student at the University of Chicago. His work on this led to a total re-evaluation of the growth in industrial lead concentrations in the atmosphere and the human body, and his subsequent campaigning was seminal in the banning of tetraethyllead in gasoline and lead solder in food cans."
    • 'Cosmos' Recap: What Lead Poisoning and Earth's Age Have in Common
    • Poisoned water - That Flinty taste - How Michigan’s state government endangered the people of Flint (Economist article)
  • Mount Hamilton "is a mountain in California's Diablo Range, in Santa Clara County, California. Mount Hamilton, at 4,216 feet (1,285 m) is a mountain overlooking Santa Clara Valley and is the site of Lick Observatory, the first permanently occupied mountain-top observatory. The other summits along its mile-long summit ridge are known by astronomy-related names."
  • From previous meetings

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