True stories

It has to be 100% true It ruins the point of a true nonfiction novel it’s supposed to be real if I wanted to read something fake I would get a fiction book. A Nonfiction book is something usually used to study or for someone else to learn from, I would be mad if I was using my History textbook (nonfiction) and learned the whole book’s truth was stretched because then all the information I had learned is basically useless and not true. When reading a memoir you have to understand it is based on a true story some things may be stretched. I believe half-truths are ok if it is ok as long as it is in a memoir otherwise no. I don’t really think it matters if Frey and Mortenson bent the truth because the story is still more than 90% true. Some things are just stretched. I think the border between Memoirs and Fiction need to be broken but for textbooks or informal books, it can’t because if someone was reading a book on how to build a car then made thousands of cars and sold them, and later found out the book was stretched on something and all of the cars blow-up or break then he will be in serious trouble. But on the same hand the differences between fiction and a memoir aren’t much, someone could write a true story and just call it a fiction novel. So basically, fiction and memoir should be combined, but true non-fiction textbooks, Informal’s, etc. for learning should stay 100% true.