Hello, ChatGPT. There is this thing called ISBN that keeps track of the book that were printed since 1970. I want to know a few things
1) Do all the books that are printed after 1970 receive ISBN? If they don't, why and what percentage doesn't (if you know the answer, please use your best guess)
2) How often do books receive editions or additional versions? Is it a negligible number or it is happening often? 