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W. A. Fowler and Robert N. Clayton in conversation in D.Clayton's room at Gregynog for the 1976 Workshop on Isotopic Anomalies, which was organized by D. Clayton. Freeman Dyson chats with H. Hildebrand at left. Dyson was very interested in the concept of isotopic anomalies and the chance to view nucleosynthesis components. See 1976 Gregynog Group for more details of this historic workshop. Robert Clayton opened the isotopic anomaly box in 1973 with his discovery of excess 16O within Allende refractory minerals. Fowler had a love of small cigars during social contemplations.

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