It is well documented regarding the history of man and the reduction of diversity. But the call to Darwin is a little light, truncated, lacking precision. He Levi-Strauss is the same tobacco. In addition, the lives of these two characters interest us less than their ideas and are off-topic. The story of their lives is suddenly a little "filler". Pascal Picq on the bottom right, but is still not totally convincing, because the mechanisms involved in the loss of diversity are not sufficiently analyzed and explained. Now it should be an important part of the demonstration. Moreover, the solutions are angelic and unrealistic, and totally lack substance. This would leave only despair for any soup? Or incantation?