Janet Browne, the foremost scientist specializing in Darwin, has authored a detailed yet comprehensible introduction to the book "On the Origin of Species" that transformed the theory of human evolution. The observations printed in the first edition of the book "On the Origin of Species" questioned the theory of human creation. In this study, Browne carefully examines Darwin's theories from their inception, presents Darwin's emotions when he read his opponents' articles, and concludes by proving that it is the most important scientific book published to date.