Changes

The average length of a best-selling book has been sharply decreasing, falling by nearly 50% in merely seven years:  in 2011, average length of a bestseller was 467 pages, but by 2017 that length had declined to 273 pages.<ref>https://scribemedia.com/how-long-should-book-be/</ref>  But some observe that book length has at times increased in the last quarter-century.<ref>https://www.theguardian.com/books/2015/dec/10/are-books-getting-longer-survey-marlon-james-hanya-yanagihara</ref>

The average length of a best-selling book has been sharply decreasing, falling by nearly 50% in merely seven years:  in 2011, average length of a bestseller was 467 pages, but by 2017 that length had declined to 273 pages.<ref>https://scribemedia.com/how-long-should-book-be/</ref>  But some observe that book length has at times increased in the last quarter-century.<ref>https://www.theguardian.com/books/2015/dec/10/are-books-getting-longer-survey-marlon-james-hanya-yanagihara</ref>

The book was called a [[codex]] in Latin, and it was a [[Roman]] improvement over the scroll.  By the fourth century the codex had gained wide acceptance, and many scrolls that were not converted to codex form were lost to posterity.

The book was called a codex in Latin, and it was a [[Roman]] improvement over the scroll.  By the fourth century the codex had gained wide acceptance, and many scrolls that were not converted to codex form were lost to posterity.

==Types==

==Types==