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Karl Popper

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Darwinism is not a testable scientific theory, but a metaphysical research program.
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Unsourced variant: Evolution is not a fact. Evolution doesn't even qualify as a theory or as a hypothesis. It is a metaphysical research program, and it is not really testable science.

 
Karl Popper

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I'm not familiar that they're dodging it. Maybe they are. But I think schools also ought to be fair to all views. Because, frankly, Darwinism is not an established scientific fact. It is a theory of evolution, that's why it's called the theory of evolution.

 
Mike Huckabee
 

The Marxist theory of history, in spite of the serious efforts of some of its founders and followers, ultimately adopted this soothsaying practice [of evading testability]. In some of its earlier formulations (for example in Marx's analysis of the character of the 'coming social revolution') their predictions were testable, and in fact falsified. Yet instead of accepting the refutations the followers of Marx re-interpreted both the theory and the evidence in order to make them agree. In this way they rescued the theory from refutation; but they did so at the price of adopting a device which made it irrefutable. They thus gave a 'conventionalist twist' to the theory; and by this stratagem they destroyed its much advertised claim to scientific status.

 
Karl Marx
 

We believe that Darwinism is the real Orthodox Church, because Darwinism asks you to believe in things unseen that are incredibly unlikely. Darwinism asks us to believe that out of pure random chance, we got a cell that is as complicated as a Boeing 777. Darwinism asks us to believe that one day there was nothing but mud and ooze, and the next day there was life, and very soon after there was intelligent life. Darwinism asks us to believe that you can destroy genetic material through random mutation and natural selection and yet end up with more genetic material. We don't really ask you to believe anything that difficult; it is sort of innate in mankind to believe that there is a God, a heavenly Father and we're asking you to just follow the consequences of that and see if possibly there could be some scientific validity to that.

 
Ben Stein
 

A theory is only as good as its assumptions. If the premises are false, the theory has no real scientific value. The only scientific criterion for judging the validity of a scientific theory is a confrontation with the data of experience.

 
Maurice Allais
 

Though he was proud of his scientific method, most of Marx' predictions are like Jewish prophecies and Christian revelations, inspiring, sometimes self-fulfilling, certainly true for the faithful, but not testable by scientific means.

 
Karl Marx
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