These breakthroughs are connected with each of these dates because they are forerunners of an invention that is a milestone in human communication: the printing press.
About 25,000 years ago humans learned to speak. Next, The first picture writings date from 8,000 years ago. Followed by the first evidence of an alphabet which comes from Phoenicia around 1,500 BCE. In 600 CE The Chinese introduced woodblock printing.Finally,Johannes Gutemberg invented the first practical printing press in 1,450CE .