Chapitre 358: Invitation

This was not a wild guess, but it could be best proved by the development of human civilization.

It took mankind nearly a million years to enter the Iron Age from the Stone Age, but only 3,200 years from the Iron Age to the Age of Steam. From the Age of Steam to the Electric Age, it merely took 150 years, and the world directly stepped into the information era in another 50 years.