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This slide set focuses on the discovery that some infant stars on the edges of star clusters are older than similar stars in the centers, a finding of NASA's Chandra and Spitzer missions. It is one of a series of short, topical presentations on new developments from NASA astrophysics missions, relevant to introductory astronomy topics. These resources are intended to help instructors include the latest discoveries (not yet in their textbooks) into their courses. The slide sets are constructed to be easily included as a lecture supplement including synopsis, references, and graphics.