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to reach in this book. But, perhaps more importantly, I aspire to arm those who are not history-deniers but know some – perhaps members of their own family or church – and find themselves inadequately prepared to argue the case.
    
    
    Evolution is a fact. Beyond reasonable doubt, beyond serious doubt, beyond sane, informed, intelligent doubt, beyond doubt evolution is a fact. The evidence for evolution is at least as strong as the evidence for the Holocaust, even allowing for eye witnesses to the Holocaust. It is the plain truth that we are cousins of chimpanzees, somewhat more distant cousins of monkeys, more distant cousins still of aardvarks and manatees, yet more distant cousins of bananas and turnips . . . continue the list as long as desired. That didn’t have to be true. It is not self-evidently, tautologically, obviously true, and there was a time when most people, even educated people, thought it wasn’t. It didn’t have to be true, but it is. We know this because a rising flood of evidence supports it. Evolution is a fact, and this book will demonstrate it. No reputable scientist disputes it, and no unbiased reader will close the book doubting it.
    Why, then, do we speak of ‘Darwin’s theory of evolution’, thereby, it seems, giving spurious comfort to those of a creationist persuasion – the history-deniers, the 40-percenters – who think the word ‘theory’ is a concession, handing them some kind of gift or victory?
    WHAT IS A THEORY? WHAT IS A FACT?
    Only a theory? Let’s look at what ‘theory’ means. The Oxford English Dictionary gives two meanings (actually more, but these are the two that matter here).Theory, Sense 1: A scheme or system of ideas or statements held as an explanation or account of a group of facts or phenomena; a hypothesis that has been confirmed or established by observation or experiment, and is propounded or accepted as accounting for the known facts; a statement of what are held to be the general laws, principles, or causes of something known or observed.
    
    Theory, Sense 2: A hypothesis proposed as an explanation; hence, a mere hypothesis, speculation, conjecture; an idea or set of ideas about something; an individual view or notion.
    
    
    
    
    Obviously the two meanings are quite different from one another. And the short answer to my question about the theory of evolution is that the scientists are using Sense 1, while the creationists are – perhaps mischievously, perhaps sincerely – opting for Sense 2. A good example of Sense 1 is the Heliocentric Theory of the Solar System, the theory that Earth and the other planets orbit the sun. Evolution fits Sense 1 perfectly. Darwin’s theory of evolution is indeed a ‘scheme or system of ideas or statements’. It does account for a massive ‘group of facts or phenomena’. It is ‘a hypothesis that has been confirmed or established by observation or experiment’ and, by generally informed consent, it is ‘a statement of what are held to be the general laws, principles, or causes of something known or observed’. It is certainly very far from ‘a mere hypothesis, speculation, conjecture’. Scientists and creationists are understanding the word ‘theory’ in two very different senses. Evolution is a theory in the same sense as the heliocentric theory. In neither case should the word ‘only’ be used, as in ‘only a theory’.
    
    
    As for the claim that evolution has never been ‘proved’, proof is a notion that scientists have been intimidated into mistrusting. Influential philosophers tell us we can’t prove anything in science. Mathematicians can prove things – according to one strict view, they are the only people who can – but the best that scientists can do is fail to disprove things while pointing to how hard they tried. Even the undisputed theory that the moon is smaller than the sun cannot, to the satisfaction of a certain kind of philosopher, be proved in the way that, for example, the Pythagorean