我先試試漢譯英。

A new way of thinking and communication appeared about 30,000 and 70,000 years ago, which was called cognition revolution. 

No one knows why it happened. 

One of the theory, which is accepted by morality of people, is that there were some changes in the way how human beings brain linked caused by a gene mutation. Because of this, man kind began a new way of thinking they had never had before, and a new language to communicate they had never used in the past.