In tandem with the closing of the millennium, Gould is planning to bring down the curtain on his nearly thirty-year stint as a monthly essayist for Natural History magazine. Well, evolution is a theory. It is also a fact. And facts and theories are different things, not rungs in a hierarchy of increasing certainty. Facts are the world's data.
Theories are structures of ideas that explain and interpret facts.
Facts do not go away when scientists debate rival theories for explaining them. Einstein's theory of gravitation replaced Newton's, but apples did not suspend themselves in mid-air pending the outcome. And humans evolved from apelike ancestors whether they did so by Darwin's proposed mechanism or by some other yet to be discovered.