I was very curious what the meaning of the title of the book. This drove me finished the book and I finally figured out I was cheated.

It seems to me that the idea of the book is a novelist surprisingly found that the evolution theory is very interesting someday and she decided to make a bunch of wired stories to elaborate it. The idea is old, the stories are scattered, and transition from one story to another story is blunt.

I am also very interested to the point that the natural selection theory has some problem to explain the altruism of the human behavior and wished she could give me some insights of this puzzle but I found noting! So disappointed!