History of Books - Good to know - Small Facts

Reading so many books as I do, it came to my mind the question; When was the first book made? I have done a small research about this, just of the fun of knowing a small part of it. 

It all starts with the development of writing and later on the development of paper and printing. The independent writing system arose in Egypt in 3100 BC and the first printing of books started in China around 600 AD (source: https://en.wikipedia.org/wiki/History_of_books) and the printing was all made by hand. Thanks to this marvelous invention, people started to share their news, spread their message and many started to publish their poetry and plays and so on. 

Still today the most read book is the Bible (3900 millions of copies)  and on second place is Works of Mao Tse Tung (820 millions of copies) and on third place is Harry Potter by J.K. Rowling (400 millions of copies). (source: statista.com)