Many contemporary philosophers, such as Daniel Dennett, have not embraced Popper's Three World conjecture, mostly due to its resemblance to mind-body dualism. The creation—evolution controversy in the United States raises the issue of whether creationistic ideas may be legitimately called science and whether evolution itself may be legitimately called science.
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In the debate, both sides and even courts in their decisions have frequently invoked Popper's criterion of falsifiability see Daubert standard. In this context, passages written by Popper are frequently quoted in which he speaks about such issues himself. For example, he famously stated " Darwinism is not a testable scientific theory, but a metaphysical research program—a possible framework for testable scientific theories. And yet, the theory is invaluable. I do not see how, without it, our knowledge could have grown as it has done since Darwin.
In trying to explain experiments with bacteria which become adapted to, say, penicillin , it is quite clear that we are greatly helped by the theory of natural selection. Although it is metaphysical, it sheds much light upon very concrete and very practical researches. It allows us to study adaptation to a new environment such as a penicillin-infested environment in a rational way: it suggests the existence of a mechanism of adaptation, and it allows us even to study in detail the mechanism at work.
He also noted that theism , presented as explaining adaptation, "was worse than an open admission of failure, for it created the impression that an ultimate explanation had been reached".
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When speaking here of Darwinism, I shall speak always of today's theory—that is Darwin's own theory of natural selection supported by the Mendelian theory of heredity , by the theory of the mutation and recombination of genes in a gene pool, and by the decoded genetic code. This is an immensely impressive and powerful theory.
The claim that it completely explains evolution is of course a bold claim, and very far from being established. All scientific theories are conjectures, even those that have successfully passed many severe and varied tests. The Mendelian underpinning of modern Darwinism has been well tested, and so has the theory of evolution which says that all terrestrial life has evolved from a few primitive unicellular organisms, possibly even from one single organism. In , regarding DNA and the origin of life he said:.
What makes the origin of life and of the genetic code a disturbing riddle is this: the genetic code is without any biological function unless it is translated; that is, unless it leads to the synthesis of the proteins whose structure is laid down by the code. But, as Monod points out, the machinery by which the cell at least the non-primitive cell, which is the only one we know translates the code "consists of at least fifty macromolecular components which are themselves coded in the DNA ".
Monod, ;  , . Thus the code can not be translated except by using certain products of its translation. This constitutes a really baffling circle; a vicious circle, it seems, for any attempt to form a model, or theory, of the genesis of the genetic code. Thus we may be faced with the possibility that the origin of life like the origin of the universe becomes an impenetrable barrier to science, and a residue to all attempts to reduce biology to chemistry and physics.
He explained that the difficulty of testing had led some people to describe natural selection as a tautology , and that he too had in the past described the theory as "almost tautological", and had tried to explain how the theory could be untestable as is a tautology and yet of great scientific interest:. My solution was that the doctrine of natural selection is a most successful metaphysical research programme. It raises detailed problems in many fields, and it tells us what we would expect of an acceptable solution of these problems.
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I still believe that natural selection works in this way as a research programme. Nevertheless, I have changed my mind about the testability and logical status of the theory of natural selection; and I am glad to have an opportunity to make a recantation.
The theory of natural selection may be so formulated that it is far from tautological. In this case it is not only testable, but it turns out to be not strictly universally true. There seem to be exceptions, as with so many biological theories; and considering the random character of the variations on which natural selection operates, the occurrence of exceptions is not surprising. Thus not all phenomena of evolution are explained by natural selection alone.
Yet in every particular case it is a challenging research program to show how far natural selection can possibly be held responsible for the evolution of a particular organ or behavioural program. These frequently quoted passages are only a very small part of what Popper wrote on the issue of evolution, however, and give the wrong impression that he mainly discussed questions of its falsifiability.
Popper never invented this criterion to give justifiable use of words like science. In fact, Popper stresses at the beginning of Logic of Scientific Discovery that "the last thing I wish to do, however, is to advocate another dogma"  and that "what is to be called a 'science' and who is to be called a 'scientist' must always remain a matter of convention or decision.
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I do not try to justify [the aims of science which I have in mind], however, by representing them as the true or the essential aims of science. This would only distort the issue, and it would mean a relapse into positivist dogmatism. There is only one way, as far as I can see, of arguing rationally in support of my proposals. This is to analyse their logical consequences: to point out their fertility—their power to elucidate the problems of the theory of knowledge. Popper had his own sophisticated views on evolution  that go much beyond what the frequently-quoted passages say.
Popper understood the universe as a creative entity that invents new things, including life, but without the necessity of something like a god, especially not one who is pulling strings from behind the curtain. He said that evolution of the genotype must, as the creationists say, work in a goal-directed way  but disagreed with their view that it must necessarily be the hand of god that imposes these goals onto the stage of life.
Instead, he formulated the spearhead model of evolution , a version of genetic pluralism. According to this model, living organisms themselves have goals, and act according to these goals, each guided by a central control. In its most sophisticated form, this is the brain of humans, but controls also exist in much less sophisticated ways for species of lower complexity, such as the amoeba. This control organ plays a special role in evolution—it is the "spearhead of evolution". The goals bring the purpose into the world.
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Mutations in the genes that determine the structure of the control may then cause drastic changes in behaviour, preferences and goals, without having an impact on the organism's phenotype. Popper postulates that such purely behavioural changes are less likely to be lethal for the organism compared to drastic changes of the phenotype.
Popper contrasts his views with the notion of the "hopeful monster" that has large phenotype mutations and calls it the "hopeful behavioural monster". After behaviour has changed radically, small but quick changes of the phenotype follow to make the organism fitter to its changed goals.
This way it looks as if the phenotype were changing guided by some invisible hand, while it is merely natural selection working in combination with the new behaviour. For example, according to this hypothesis, the eating habits of the giraffe must have changed before its elongated neck evolved. Popper contrasted this view as "evolution from within" or "active Darwinism" the organism actively trying to discover new ways of life and being on a quest for conquering new ecological niches ,   with the naturalistic "evolution from without" which has the picture of a hostile environment only trying to kill the mostly passive organism, or perhaps segregate some of its groups.
Raven when, in his Science, Religion, and the Future , , he calls this conflict 'a storm in a Victorian tea-cup'; though the force of this remark is perhaps a little impaired by the attention he pays to the vapours still emerging from the cup—to the Great Systems of Evolutionist Philosophy, produced by Bergson, Whitehead, Smuts, and others. In his later work, however, when he had developed his own "spearhead model" and "active Darwinism" theories, Popper revised this view and found some validity in the controversy:.
I have to confess that this cup of tea has become, after all, my cup of tea; and with it I have to eat humble pie. Popper and John Eccles speculated on the problem of free will for many years, generally agreeing on an interactionist dualist theory of mind. However, although Popper was a body-mind dualist, he did not think that the mind is a substance separate from the body : he thought that mental or psychological properties or aspects of people are distinct from physical ones. When he gave the second Arthur Holly Compton Memorial Lecture in , Popper revisited the idea of quantum indeterminacy as a source of human freedom.
Eccles had suggested that "critically poised neurons" might be influenced by the mind to assist in a decision.
Popper criticised Compton's idea of amplified quantum events affecting the decision. He wrote:. The idea that the only alternative to determinism is just sheer chance was taken over by Schlick , together with many of his views on the subject, from Hume , who asserted that "the removal" of what he called "physical necessity" must always result in "the same thing with chance. As objects must either be conjoin'd or not, I shall later argue against this important doctrine according to which the alternative to determinism is sheer chance. Yet I must admit that the doctrine seems to hold good for the quantum-theoretical models which have been designed to explain, or at least to illustrate, the possibility of human freedom.
This seems to be the reason why these models are so very unsatisfactory. Hume's and Schlick's ontological thesis that there cannot exist anything intermediate between chance and determinism seems to me not only highly dogmatic not to say doctrinaire but clearly absurd; and it is understandable only on the assumption that they believed in a complete determinism in which chance has no status except as a symptom of our ignorance.
Popper called not for something between chance and necessity but for a combination of randomness and control to explain freedom, though not yet explicitly in two stages with random chance before the controlled decision, saying, "freedom is not just chance but, rather, the result of a subtle interplay between something almost random or haphazard, and something like a restrictive or selective control. Then in his book with John Eccles, The Self and its Brain , Popper finally formulates the two-stage model in a temporal sequence.
And he compares free will to Darwinian evolution and natural selection:. New ideas have a striking similarity to genetic mutations. Now, let us look for a moment at genetic mutations. Mutations are, it seems, brought about by quantum theoretical indeterminacy including radiation effects. Accordingly, they are also probabilistic and not in themselves originally selected or adequate, but on them there subsequently operates natural selection which eliminates inappropriate mutations.
Now we could conceive of a similar process with respect to new ideas and to free-will decisions, and similar things. That is to say, a range of possibilities is brought about by a probabilistic and quantum mechanically characterised set of proposals, as it were—of possibilities brought forward by the brain. On these there then operates a kind of selective procedure which eliminates those proposals and those possibilities which are not acceptable to the mind. In an interview  that Popper gave in with the condition that it should be kept secret until after his death, he summarised his position on God as follows: "I don't know whether God exists or not.
Some forms of atheism are arrogant and ignorant and should be rejected, but agnosticism —to admit that we don't know and to search—is all right. When I look at what I call the gift of life, I feel a gratitude which is in tune with some religious ideas of God. However, the moment I even speak of it, I am embarrassed that I may do something wrong to God in talking about God.
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