Darwin, Prescient with ‘Origin,’ Is Still Influential - NYTimes.com

Darwin, Prescient with ‘Origin,’ Is Still Influential - NYTimes.com: "Biologists quickly accepted the idea of evolution, but for decades they rejected natural selection, the mechanism Darwin proposed for the evolutionary process. Until the mid-20th century they largely ignored sexual selection, a special aspect of natural selection that Darwin proposed to account for male ornaments like the peacock’s tail.

And biologists are still arguing about group-level selection, the idea that natural selection can operate at the level of groups as well as on individuals. Darwin proposed group selection — or something like it; scholars differ as to what he meant — to account for castes in ant societies and morality in people."