Pictured center are Tom Tombrello (Caltech), David Lambert (Texas) and Roy Lewis (Chicago) at NASA Workshop on Isotopic Anomalies at Clemson. Nov. 12, 1990. During the 1960s Tombrello and Clayton were colleagues at Caltech's Kellogg lab working on nuclear reactions in stars. Roy Lewis pioneered chemical isolation of presolar grains with Anders at Chicago.

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