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Upper and Lower PMT arrays during assembly Detection of Percc1 expressing cells (red) amongst the epithelial cells (green) of the intestinal villi in a mouse. The site of Simons Observatory in the Atacama Desert in Chile. (Credit: Copyright Debra Kellner/Simons Foundation) Photo - Different wall colors on Georgetown row houses. iStock photo Photo - Bok and Mayall telescopes at Kitt Peak Photo - From left to right: Vahe Tshitoyan, Anubhav Jain, Leigh Weston, and John Dagdelen were among the participants in a text-mining project that used machine learning to analyze 3.3 million abstracts from materials science papers. (Credit: Marilyn Chung/Berkeley Lab)