The first time is the use of language, which has become an indispensable tool for human beings to exchange ideas and spread information. (Time: Post-Babel Era)

The second time was the appearance and use of characters, which made a great breakthrough in the preservation and dissemination of information, greatly exceeding the limitations of time and region. (Time: Iron Age, about BC14th century)

The third time was the invention and use of printing, which made books, newspapers and periodicals an important medium for information storage and dissemination. (Time: In the 6th century A.D., China began to have rigid printing, and it was not until the 5th century A.D./KLOC-0 that it entered the perfect modern printing. )

The fourth time was the use of telephone, radio and television, which made mankind enter the era of using electromagnetic waves to spread information. (Time:19th century)

The fifth is the use of computers and the Internet, that is, the emergence of the Internet. (Time: Modern, marked by the advent of 1946 electronic computer)