However, how long is the history of mankind? According to the current archaeological documents and various fossils, it has a history of at least 4 million years! Three million years ago, humans turned to walk upright; 2.9 million years ago, humans began to use tools; But why is civilization only four thousand years old?
So scientists have been exploring and looking for various reasons! So far, what is the most credible explanation that Bian Xiao thinks? Civilization? It may not have existed before; However, it is the fault of history that keeps us from finding the shadow of their existence!
Is the history of human civilization really only 5,000 to 4,000 years old? The mysterious Mayan civilization, their disappearance, dates back to 8 thousand years ago! In 9000 BC, the Mayans built the pyramids and Stonehenge successively. These are the products of modern science and technology, and they may not be able to make them!
So the Mayans have always been suspected by many people to be the forces supported by aliens on earth! Coincidentally, in fact, the Mayans are not the oldest! In 20 18, Wayne, a professor of astronomy at Columbia University, and his research team discovered an abandoned nuclear reactor in Gabon, Africa.
After investigation, it has a history of at least 200,000 years! In other words, there is not only our civilization in history, but also a civilization with advanced technology long ago!
As for why they disappeared, there have been many speculations and possibilities! Some people say that they died in nuclear war; Others say that they fled the earth and immigrated to another planet. All in all, they are more convincing!