The Science Book Review subforum has been relocated and is no longer visible on the main page of the Physics Forums. Users are questioning the reason for this change and whether it is intentional. There is speculation about a possible connection to Dr. Kaku, although this remains unconfirmed. The discussion reflects a sense of nostalgia for the subforum and curiosity about its current status. Overall, the community seeks clarity on the disappearance of the threads and the subforum itself.