Once upon a time, a tribe passed the tribes around them, both intellectually and physically.

But for some reason, the tribe suddenly disappeared on a dark night.

The surrounding tribes were very surprised.

It was not until thousands of years later that the mystery of the tribe disappeared.

It turned out that the people in this tribe originally invented clothes made from animal skins, which kept them warm and warm, and protected the wind from the cold.

In order not to know this secret by other naked tribes, all the fallen people quietly moved to an uninhabited mountain forest.

When scientists discovered them, people in this tribe still lived in primitive life of slash and burn and skins because of their secular seclusion.

Sentiment: originally, the advanced tribes were left behind behind the history due to their occlusion and neglect of contact with the outside world. This is very pertinent.

It seems that the inertia of the times is how to corrode the progress of a nation and how to wear away the aspirant of the nation. Their original pride has become the driving force behind it.