Best known for his contributions to evolutionary theory and one of the most influential figures in human history, Charles Darwin established that all species of life on earth descended over time from common ancestors through a process that he called natural selection. Darwin published his theory of evolution with compelling evidence in his 1859 book “On the Origin of Species.”
Darwin’s second book on evolutionary theory, “The Descent of Man, and Selection in Relation to Sex,” was published in 1871. In this work Darwin applies evolutionary theory to human evolution, and details his theory of sexual selection, a form of biological adaptation distinct from, yet interconnected with, natural selection. The book discusses many related issues, including evolutionary psychology, evolutionary ethics, differences between human races, differences between sexes, the dominant role of women in choosing mating partners, and the relevance of evolutionary theory to society. [Source: Wikipedia]