The development of human culture, after the late Paleolithic age, has entered the Neolithic Age and the Metal Age It is only 10,000 years from the Neolithic Age to the present, and it is only a few thousand years from the Metal Age to the present  People have begun to use electric energy to the present
For more than a hundred years, the use of atomic energy has only been a matter of the last few decades, and the development stage before the Neolithic era can easily be hundreds of thousands to millions of years
The development of human culture is not a constant velocity motion, but is similar to an accelerated motion. Later, the speed of advancement increases exponentially.