Most people are aware that human beings are evolved from generations to generations, while most people are not aware how human beings are evolved to the current appearance step by step. This book is a popular science knowledge book about human evolution history. The author relates the evolving process of human organs, such as arms and legs, hair, skin color and brain in interesting and plain language, on top of which, the author provides profound introduction on how human body issues, such as lips and breasts, menstruation and fertilization, penis and testicle, can affect marriage system and moral civilization. The author is good at adopting different scientific cases in strict logic and reasonable layout. This book presents fully warm human natures and feelings in objective and scientific narrative. - from Amzon