Geologist Walter Alvarez was working away on some limestone samples in Gubbio, Italy, when he became intrigued by an odd layer of rock. He was looking at the K-T boundary. Underneath it, there are dinosaur fossils. Above it, there are none. And Walter was about to stumble on the reason why.In this final episode of our science series, we pair a rock sample from the K-T boundary with a unique portrait by <a href="https://carmenlomasgarza.com/">Carmen Lomas Garza</a> to tell the story of the dinosaur extinction -- how it happened, why it happened, and who figured it out.With <a href="https://naturalhistory.si.edu/staff/kirk-johnson">Kirk Johnson</a>, director of the Smithsonian's National Museum of Natural History, and <a href="https://npg.si.edu/staff/ta%C3%ADna-caragol">Taína Caragol</a>, curator of painting and sculpture and Latino art and history at the National Portrait Gallery.See the portraits we discussed:<a href="https://npg.si.edu/object/npg_NPG.2019.99?destination=edan-search/default_search%3Fedan_local%3D1%26edan_q%3Dwalter%252Balvarez">Walter Alvarez</a>, by Carmen Lomas Garza<a href="https://catalog.archives.gov/id/39146968">Luis Alvarez</a>, Lawrence Berkeley National Laboratory

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