A student once asked margaret mead, a famous anthropologist, a question-what was the initial symbol of human civilization? Many students guess that the answers are hooks, stone tools, fire and so on;

However, Meade's answer surprised everyone. She said that the first sign of human civilization was that we found that "a broken humerus has healed again".

Meade further explained—

It is extremely dangerous to break the femur in the animal kingdom. If an animal breaks its thigh, it actually means death, because it can't escape danger, can't go to the river to drink water or hunt food, and will soon be eaten by wandering wild animals.

The healed humerus shows that someone has spent a long time taking care of the injured person-treating the wound, providing food and protecting him from attack;

Finally, Meade concluded meaningfully: helping others out of trouble is the starting point of civilization!