#3 – Printing Press
Ever since the 11th century, there were ideas of a printing press around the world. However, the person that realized these ideas in an efficient way and made it popular was Johann Gutenberg. He did so in the 1430s. He thought of several great ideas to perfect this invention, such as creating metal printing blocks, as they were proved to be much more durable then the hand-carved wooden letters that were used up until that point.
He was also notable for his advancement in ink and paper production. The printing press had an amazing impact for people all around the world, because information could be recorded and spread around the world much faster than before. It also made books far more affordable to middle class people.