Sarah Wild writes: “The Library of Congress (LC) is home to more than 175 million works humans have produced, from ebooks to ancient scrolls, which it aims to preserve for future generations. But even a library this extensive can only preserve a fraction of the books published annually around the world, let alone other formats. To learn more about how LC makes its weighty decisions about shaping our society’s collective memory, Scientific American spoke with the library’s collection development officer Joseph Puccio, who retired last month, and director for preservation Jacob Nadal.”