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| − | '''Monotheism''' | + | '''Monotheism''' is the belief in only one [[god]]. Monotheistic religions include [[Christianity]], [[Judaism]], [[Islam]] and [[Bahai]]. Monotheism has been gradually replacing [[polytheism]] over the last two millennia. |
| − | It is impossible to exaggerate the magnitude of the problem that
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| − | Darwin and Wallace solved. I could mention the anatomy, cellular
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| − | structure, biochemistry and behaviour of literally any living
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| − | organism by example. But the most striking feats of apparent
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| − | design are those picked out - for obvious reasons - by creationist
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| − | authors, and it is with gentle irony that I derive mine from a
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| − | creationist book. Life - How Did It Get Here?, with no named
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| − | author but published by the Watchtower Bible and Tract Society in
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| − | sixteen languages and eleven million copies, is obviously a firm
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| − | favourite because no fewer than six of those eleven million copies
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| − | have been sent to me as unsolicited gifts by well-wishers from
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| − | around the world.
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| − | Picking a page at random from this anonymous and lavishly distributed
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| − | work, we find the sponge known as Venus' Flower Basket
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| − | (Euplectella), accompanied by a quotation from Sir David
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| − | Attenborough, no less: 'When you look at a complex sponge
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| − | skeleton such as that made of silica spicules which is known as
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| − | Venus' Flower Basket, the imagination is baffled. How could quasiindependent
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| − | microscopic cells collaborate to secrete a million glassy
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| − | splinters and construct such an intricate and beautiful lattice? We
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| − | do not know.' The Watchtower authors lose no time in adding their
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| − | own punchline: 'But one thing we do know: Chance is not the likely
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| − | designer.' No indeed, chance is not the likely designer. That is one
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| − | thing on which we can all agree. The statistical improbability of
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| − | phenomena such as Euplectella's skeleton is the central problem
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| − | that any theory of life must solve. The greater the statistical
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| − | improbability, the less plausible is chance as a solution: that is
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| − | what improbable means. But the candidate solutions to the riddle
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| − | of improbability are not, as is falsely implied, design and chance.
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| − | They are design and natural selection. Chance is not a solution,
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| − | given the high levels of improbability we see in living organisms,
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| − | 120 T H K G O D I) E I, V S I O N
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| − | and no sane biologist ever suggested that it was. Design is not a real
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| − | solution either, as we shall see later; but for the moment I want to
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| − | continue demonstrating the problem that any theory of life must
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| − | solve: the problem of how to escape from chance.
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| − | Turning Watchtower's page, we find the wonderful plant known
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| − | as Dutchman's Pipe (Aristolochia trilobata), all of whose parts seem
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| − | elegantly designed to trap insects, cover them with pollen and send
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| − | them on their way to another Dutchman's Pipe. The intricate
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| − | elegance of the flower moves Watchtower to ask: 'Did all of this
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| − | happen by chance? Or did it happen by intelligent design?' Once
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| − | again, no of course it didn't happen by chance. Once again, intelligent
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| − | design is not the proper alternative to chance. Natural
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| − | selection is not only a parsimonious, plausible and elegant solution;
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| − | it is the only workable alternative to chance that has ever been
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| − | suggested. Intelligent design suffers from exactly the same objection
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| − | as chance. It is simply not a plausible solution to the riddle of
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| − | statistical improbability. And the higher the improbability, the more
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| − | implausible intelligent design becomes. Seen clearly, intelligent
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| − | design will turn out to be a redoubling of the problem. Once again,
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| − | this is because the designer himself (/herself/itself) immediately
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| − | raises the bigger problem of his own origin. Any entity capable of
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| − | intelligently designing something as improbable as a Dutchman's
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| − | Pipe (or a universe) would have to be even more improbable than a
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| − | Dutchman's Pipe. Far from terminating the vicious regress, God
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| − | aggravates it with a vengeance.
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| − | Turn another Watchtower page for an eloquent account of the
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| − | giant redwood (Sequoiadendron giganteum), a tree for which I
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| − | have a special affection because I have one in my garden - a mere
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| − | baby, scarcely more than a century old, but still the tallest tree in
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| − | the neighbourhood. 'A puny man, standing at a sequoia's base, can
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| − | only gaze upward in silent awe at its massive grandeur. Does it
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| − | make sense to believe that the shaping of this majestic giant and
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| − | of the tiny seed that packages it was not by design?' Yet again, if
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| − | you think the only alternative to design is chance then, no, it does
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| − | not make sense. But again the authors omit all mention of the real
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| − | alternative, natural selection, either because they genuinely don't
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| − | understand it or because they don't want to.
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| − | The process by which plants, whether tiny pimpernels or
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| − | W H Y T l i l - I U ; A L M O S T C F R T A I X L Y I S N O G O D 121
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| − | massive wellingtonias, acquire the energy to build themselves is
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| − | photosynthesis. Watchtower again: ' "There are about seventy
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| − | separate chemical reactions involved in photosynthesis," one
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| − | biologist said. "It is truly a miraculous event." Green plants have
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| − | been called nature's "factories" - beautiful, quiet, nonpolluting,
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| − | producing oxygen, recycling water and feeding the world. Did they
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| − | just happen by chance? Is that truly believable?' No, it is not believable;
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| − | but the repetition of example after example gets us nowhere.
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| − | Creationist 'logic' is always the same. Some natural phenomenon is
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| − | too statistically improbable, too complex, too beautiful, too aweinspiring
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| − | to have come into existence by chance. Design is the only
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| − | alternative to chance that the authors can imagine. Therefore a
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| − | designer must have done it. And science's answer to this faulty logic
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| − | is also always the same. Design is not the only alternative to chance.
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| − | Natural selection is a better alternative. Indeed, design is not a real
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| − | alternative at all because it raises an even bigger problem than it
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| − | solves: who designed the designer? Chance and design both fail as
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| − | solutions to the problem of statistical improbability, because one of
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| − | them is the problem, and the other one regresses to it. Natural
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| − | selection is a real solution. It is the only workable solution that has
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| − | ever been suggested. And it is not only a workable solution, it is a
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| − | solution of stunning elegance and power.
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| − | What is it that makes natural selection succeed as a solution to
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| − | the problem of improbability, where chance and design both fail at
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| − | the starting gate? The answer is that natural selection is a cumulative
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| − | process, which breaks the problem of improbability up into
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| − | small pieces. Each of the small pieces is slightly improbable, but not
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| − | prohibitively so. When large numbers of these slightly improbable
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| − | events are stacked up in series, the end product of the accumulation
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| − | is very very improbable indeed, improbable enough to be far
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| − | beyond the reach of chance. It is these end products that form the
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| − | subjects of the creationist's wearisomely recycled argument. The
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| − | creationist completely misses the point, because he (women should
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| − | for once not mind being excluded by the pronoun) insists on treating
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| − | the genesis of statistical improbability as a single, one-off event.
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| − | He doesn't understand the power of accumulation.
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| − | In Climbing Mount Improbable, I expressed the point in a
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| − | parable. One side of the mountain is a sheer cliff, impossible to
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| − | 1 2 2 • •! • ; . . ; • ) > ! » r i s ; s i o
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| − | climb, but on the other side is a gentle slope to the summit. On the
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| − | summit sits a complex device such as an eye or a bacterial flagellar
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| − | motor. The absurd notion that such complexity could
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| − | spontaneously self-assemble is symbolized by leaping from the foot
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| − | of the cliff to the top in one bound. Evolution, by contrast, goes
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| − | around the back of the mountain and creeps up the gentle slope to
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| − | the summit: easy! The principle of climbing the gentle slope as
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| − | opposed to leaping up the precipice is so simple, one is tempted to
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| − | marvel that it took so long for a Darwin to arrive on the scene and
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| − | discover it. By the time he did, nearly three centuries had elapsed
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| − | since Newton's annus mirabilis, although his achievement seems,
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| − | on the face of it, harder than Darwin's.
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| − | Another favourite metaphor for extreme improbability is the
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| − | combination lock on a bank vault. Theoretically, a bank robber
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| − | could get lucky and hit upon the right combination of numbers by
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| − | chance. In practice, the bank's combination lock is designed with
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| − | enough improbability to make this tantamount to impossible -
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| − | almost as unlikely as Fred Hoyle's Boeing 747. But imagine a badly
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| − | designed combination lock that gave out little hints progressivelythe
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| − | equivalent of the 'getting warmer' of children playing Hunt the
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| − | Slipper. Suppose that when each one of the dials approaches its
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| − | correct setting, the vault door opens another chink, and a dribble
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| − | of money trickles out. The burglar would home in on the jackpot
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| − | in no time.
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| − | Creationists who attempt to deploy the argument from improbability
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| − | in their favour always assume that biological
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| − | adaptation is a question of the jackpot or nothing. Another name
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| − | for the 'jackpot or nothing' fallacy is 'irreducible complexity' (IC).
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| − | Either the eye sees or it doesn't. Either the wing flies or it doesn't.
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| − | There are assumed to be no useful intermediates. But this is simply
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| − | wrong. Such intermediates abound in practice - which is exactly
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| − | what we should expect in theory. The combination lock of life is a
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| − | 'getting warmer, getting cooler, getting warmer' Hunt the Slipper
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| − | device. Real life seeks the gentle slopes at the back of Mount
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| − | Improbable, while creationists are blind to all but the daunting
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| − | precipice at the front.
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| − | Darwin devoted an entire chapter of the Origin of Species to
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| − | 'Difficulties on the theory of descent with modification', and it is
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| − | W H Y r i-i r R r A I M O S T C t R T A I N I Y IS NO <> o D 123
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| − | fair to say that this brief chapter anticipated and disposed of every
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| − | single one of the alleged difficulties that have since been proposed,
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| − | right up to the present day. The most formidable difficulties are
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| − | Darwin's 'organs of extreme perfection and complication', sometimes
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| − | erroneously described as 'irreducibly complex'. Darwin
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| − | singled out the eye as posing a particularly challenging problem: 'To
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| − | suppose that the eye with all its inimitable contrivances for adjusting
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| − | the focus to different distances, for admitting different amounts
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| − | of light, and for the correction of spherical and chromatic
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| − | aberration, could have been formed by natural selection, seems, I
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| − | freely confess, absurd in the highest degree.' Creationists gleefully
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| − | quote this sentence again and again. Needless to say, they never
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| − | quote what follows. Darwin's fulsomely free confession turned out
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| − | to be a rhetorical device. He was drawing his opponents towards
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| − | him so that his punch, when it came, struck the harder. The punch,
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| − | of course, was Darwin's effortless explanation of exactly how the
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| − | eye evolved by gradual degrees. Darwin may not have used the
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| − | phrase 'irreducible complexity', or 'the smooth gradient up Mount
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| − | Improbable', but he clearly understood the principle of both.
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| − | 'What is the use of half an eye?' and 'What is the use of half a
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| − | wing?' are both instances of the argument from 'irreducible complexity'.
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| − | A functioning unit is said to be irreducibly complex if the
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| − | removal of one of its parts causes the whole to cease functioning.
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| − | This has been assumed to be self-evident for both eyes and wings.
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| − | But as soon as we give these assumptions a moment's thought, we
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| − | immediately see the fallacy. A cataract patient with the lens of her
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| − | eye surgically removed can't see clear images without glasses, but
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| − | can see enough not to bump into a tree or fall over a cliff. Half a
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| − | wing is indeed not as good as a whole wing, but it is certainly better
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| − | than no wing at all. Half a wing could save your life by easing your
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| − | fall from a tree of a certain height. And 51 per cent of a wing could
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| − | save you if you fall from a slightly taller tree. Whatever fraction of
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| − | a wing you have, there is a fall from which it will save your life
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| − | where a slightly smaller winglet would not. The thought experiment
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| − | of trees of different height, from which one might fall, is just
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| − | one way to see, in theory, that there must be a smooth gradient
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| − | of advantage all the way from 1 per cent of a wing to 100 per
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| − | cent. The forests are replete with gliding or parachuting animals
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| − | 124 T H E G O D 1> E I U S I O N
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| − | illustrating, in practice, every step of the way up that particular
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| − | slope of Mount Improbable.
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| − | By analogy with the trees of different height, it is easy to imagine
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| − | situations in which half an eye would save the life of an animal
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| − | where 49 per cent of an eye would not. Smooth gradients are provided
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| − | by variations in lighting conditions, variations in the distance
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| − | at which you catch sight of your prey - or your predators. And, as
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| − | with wings and flight surfaces, plausible intermediates are not only
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| − | easy to imagine: they are abundant all around the animal kingdom.
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| − | A flatworm has an eye that, by any sensible measure, is less than
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| − | half a human eye. Nautilus (and perhaps its extinct ammonite
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| − | cousins who dominated Paleozoic and Mesozoic seas) has an eye
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| − | that is intermediate in quality between flatworm and human.
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| − | Unlike the flatworm eye, which can detect light and shade but see
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| − | no image, the Nautilus 'pinhole camera' eye makes a real image;
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| − | but it is a blurred and dim image compared to ours. It would be
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| − | spurious precision to put numbers on the improvement, but nobody
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| − | could sanely deny that these invertebrate eyes, and many others, are
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| − | all better than no eye at all, and all lie on a continuous and shallow
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| − | slope up Mount Improbable, with our eyes near a peak - not the
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| − | highest peak but a high one. In Climbing Mount Improbable, I
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| − | devoted a whole chapter each to the eye and the wing, demonstrating
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| − | how easy it was for them to evolve by slow (or even, maybe, not
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| − | all that slow) gradual degrees, and I will leave the subject here.
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| − | So, we have seen that eyes and wings are certainly not irreducibly
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| − | complex; but what is more interesting than these particular
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| − | examples is the general lesson we should draw. The fact that so
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| − | many people have been dead wrong over these obvious cases should
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| − | serve to warn us of other examples that are less obvious, such as the
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| − | cellular and biochemical cases now being touted by those
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| − | creationists who shelter under the politically expedient euphemism
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| − | of 'intelligent design theorists'.
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| − | We have a cautionary tale here, and it is telling us this: do not
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| − | just declare things to be irreducibly complex; the chances are that
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| − | you haven't looked carefully enough at the details, or thought carefully
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| − | enough about them. On the other hand, we on the science side
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| − | must not be too dogmatically confident. Maybe there is something
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| − | out there in nature that really does preclude, by its genuinely
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| − | W H Y ' 1 1 I K R K A L M O S T (.: F R T A 1 N [. Y 15 NO (, O I) 125
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| − | irreducible complexity, the smooth gradient of Mount Improbable.
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| − | The creationists are right that, if genuinely irreducible complexity
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| − | could be properly demonstrated, it would wreck Darwin's theory.
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| − | Darwin himself said as much: 'If it could be demonstrated that any
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| − | complex organ existed which could not possibly have been formed
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| − | by numerous, successive, slight modifications, my theory would
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| − | absolutely break down. But I can find no such case.' Darwin could
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| − | find no such case, and nor has anybody since Darwin's time, despite
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| − | strenuous, indeed desperate, efforts. Many candidates for this holy
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| − | grail of creationism have been proposed. None has stood up to
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| − | analysis.
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| − | In any case, even though genuinely irreducible complexity would
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| − | wreck Darwin's theory if it were ever found, who is to say that it
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| − | wouldn't wreck the intelligent design theory as well? Indeed, it
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| − | already has wrecked the intelligent design theory, for, as I keep saying
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| − | and will say again, however little we know about God, the one
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| − | thing we can be sure of is that he would have to be very very
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| − | complex and presumably irreducibly so!
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| | ==See also== | | ==See also== |
| | * [[Atheism]] - the lack of belief in gods. | | * [[Atheism]] - the lack of belief in gods. |