The Bible is actually a library of sixty-six books, which is written by a total of forty-four authors over 1500 years. The thirty-nine books of the Old Testament are composed between 400 and 1400 BC, the twenty-seven books of the New Testament between 50 and 100 AD. When the Bible was written, there were actually no verses or chapters as there are today. As a matter of fact, a lot of early and handwritten manuscripts were written without spaces between the words. About 1228 AD, Stephen Langton divided the Bible into several chapters. The Old Testament was also divided into verses in 1448 AD by R. Nathan, and in 1551 AD, the New Testament was divided into verses by Robert Stephanus. Geneva Bible of 1560 AD was the very first complete Bible with chapters as well as verse divisions. There's no single canonical "Bible." A lot of Bibles have evolved with diverging and overlapping contents. Different religious traditions have also produced various recensions with several selections of texts. However, these overlap, which created a common core. With an estimated total sales of over five billion copies and counting, the Bible is considered to be the best-selling book of all time and has an estimated annual sales rate of a hundred million copies. It has also been a major influence on history and literature, particularly in the West, where the Gutenberg Bible was considered as the very first mass-printed book. This was also the first book that was ever printed with the use of movable type.