Can you summarize the classic story The Cat in the Hat in one sentence? How about Harry Potter and the Sorcerer's Stone or A Wrinkle in Time? This is just one small part of what librarians in the Children’s and Young Adults’ Cataloging Program or CYAC (pronounced kahy-ak) at the Library of Congress have been doing for decades. This week, the CYAC Program celebrates their fifty-year anniversary at the Library.