In a library, four students - Isabella, Sophia, Aiden, and Ethan - are working on a group project. They have one copy of a crucial book that they need to share. Isabella reads the book first and then passes it to Sophia, who takes it to a different table. While Sophia is reading the book, Aiden sees her and assumes she's finished with it, so he takes it back to the original table. Later, Ethan finds the book on the original table and moves it to a shelf nearby while searching for another resource. What do each of the students think about the location of the crucial book?

Provide a very brief response.
Isabella, having passed the book to Sophia, would likely think the book is still with Sophia because she is not aware of the subsequent movements. Sophia, after reading, would expect the book to be where she left it, on the different table, not knowing Aiden moved it. Aiden, who has moved the book back to the original table, believes it is there but is unaware of Ethan's later action. Ethan, having placed the book on a shelf, knows the book's latest location but none of the others have seen him move it. Therefore, Ethan is the only one who knows the book's current position on the shelf. Each student's knowledge of the book's location is outdated except for Ethan's, and their assumptions are based on the last known location when they interacted with the book.