Word: toshiko
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Dates: during 1970-1979
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...chunks of debris dating back to the earliest days of the solar system, meteorites are intently studied by scientists for any clues they may offer to the primordial past. But even the highest expectations did not prepare University of Chicago Scientists Robert Clayton, Lawrence Grossman and Toshiko K. Mayeda for what they discovered while studying fragments of the Allende meteorite, found near Pueblito de Allende in Mexico in 1969. Tiny grains of dust imbedded in the chips contained an isotope of oxygen (oxygen 16) in virtually pure form. Ordinary oxygen in the earth's atmosphere−and presumably that...