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story of evolution
The Evidence for Evolution
The theory of evolution really does explain everything in biology. In the hope of diminishing such obscurantism, the prolific English biology writer Richard Dawkins has devoted his latest book to demonstrating the explanatory power of evolutionary ideas while hammering the creationists at every turn.
Dawkins invites the reader to share the frustration of an imaginary history teacher, some of whose students refuse to accept that the Roman Empire ever existed, or that Latin is the mother tongue from which the Romance languages evolved.
Dawkins has a nice sense of irony, deployed without mercy on the opponents of evolution. Imagine a chain of rabbit generations, daughter-mother-grandmother, stretching back into evolutionary time. To refute the creationists, who like to dismiss evolution as “just a theory,” he keeps insisting that evolution is an undeniable fact. A moment’s reflection reveals the problem: We don’t speak of Darwin’s fact of evolution. So is evolution a fact or a theory? If the theory of evolution is still in full flux - as befits any scientific theory at the forefront of research - how can evolution be said to be a fact?
Dawkins is aware that evolution is commonly called a theory but deems “theory” too wishy-washy a term because it connotes the idea of hypothesis. Evolution, in Dawkins’s view, is a concept as bulletproof as a mathematical theorem, even though it can’t be proved by rigorous logical proofs. Philosophers of science, who are the arbiters of such issues, say science consists largely of facts, laws and theories. The facts are the facts, the laws summarize the regularities in the facts, and the theories explain the laws. Evolution can fall into only one of these categories, and it’s a theory.
Other systems of thought, like religion, are founded on immutable dogma, whereas science changes to accommodate new knowledge. It’s the highest-level elements in the cognitive structure - the theories - that are sacrificed when fundamental change is needed. Ptolemaic theory yielded when astronomers found that Copernicus’s better explained the observations; Newton’s theory of gravitation turned out to be a special case of Einstein’s.
If a theory by nature is liable to change, it cannot be considered absolutely true. A theory, however strongly you believe in it, inherently holds a small question mark. Since the theory of evolution explains and is in turn supported by all the known facts of biology, it can be regarded as seriously robust.
The best way, in my view, is to distinguish between evolution as history and evolution as science. Evolution is indeed a historical fact. Every living thing and every fossil-bearing rock bears evidence that evolution occurred. But evolution is not a scientific fact as philosophers of science see it. In science it plays a far grander role: it is the theory without which nothing in biology makes sense. Creationists insist evolution is only a theory, Dawkins that it’s only a fact. You could havethe book here.
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