Ernst Mayr

...anyone who writes about "Darwin's theory of evolution" in the singular, without segregating the theories of gradual evolution, common descent, read more

...anyone who writes about "Darwin's theory of evolution" in the singular, without segregating the theories of gradual evolution, common descent, speciation, and the mechanism of natural selection, will be quite unable to discuss the subject competently.

The history of science knows scores of instances where an investigator was in the possession of all the important facts read more

The history of science knows scores of instances where an investigator was in the possession of all the important facts for a new theory but simply failed to ask the right questions.

Evolution as such is no longer a theory for a modern author. It is as much a fact as that read more

Evolution as such is no longer a theory for a modern author. It is as much a fact as that the earth revolves around the sun.

Every politician, clergyman, educator, or physician, in short, anyone dealing with human individuals, is bound to make grave mistakes if read more

Every politician, clergyman, educator, or physician, in short, anyone dealing with human individuals, is bound to make grave mistakes if he ignores these two great truths of population zoology: (1) no two individuals are alike, and (2) both environment and genetic endowment make a contribution to nearly every trait.

Scientific progress consists in the development of new concepts.

Scientific progress consists in the development of new concepts.