Talk:Falsifiability of evolution

Misconceptions about the Theory of Evolution

Many people assume the "Theory of Evolution" is a single theory. It is not. Rather, it is a collection of 1,000,000+ theories, papers, experiments, observations and tests, all of which contribute to the overall theory of evolution". The Bible is similarly comprised of a collection of books which are a collection of verses.

A common false assumption made is that disproving one of the underlying theories, invalidates the entire theory of evolution. Unlike the Bible, evolutionary theory does not claim to be Inerrant. An error in a single theory does not disprove the larger body of knowledge. Falsifying the "Theory of Evolution" would require disproving thousands of supporting theories.PerpetualAngst 16:23, 20 June 2007 (EDT)

So you are agreeing that evolution per se is not falsifiable? Philip J. Rayment 09:43, 21 June 2007 (EDT)

With apologies to Mr. Rayment, I must take issue with Angst's claim that "The Bible claims to be inerrant." It makes no such claim. And even if it did claim to be inerrant, finding an error would only disprove the individual proposition of inerrancy -- it would not prove that everything in the Bible is wrong. Ungtss

Correction accepted. The Bible makes no claim to be inerrant. Instead, others make this claim of the Bible. Similarly, finding an error in the theory of evolution would only disprove the individual proposition -- it would not disprove evolutionary theory in it's entirety. PerpetualAngst

The Theory of Evolution is still falsifiable. Tens of thousands of papers and supporting theories would need to be refuted before one could claim the larger evolutionary theory has been refuted. PerpetualAngst

Okay, that's your position, but clearly it's not something that even all evolutionists agree on. And I did notice the error in claiming that the Bible claims to be inerrant, but whilst the Bible doesn't directly explicitly claim that, I believe that is a reasonable deduction from what it does claim, and furthermore it wasn't the key point that PerpetualAngst was making, so I decided to ignore that point (which is not to suggest that there was anything wrong with Ungtss responding to it). Philip J. Rayment 10:30, 21 June 2007 (EDT)

The Theory of Evolution is still falsifiable. Tens of thousands of papers and supporting theories would need to be refuted before one could claim the larger evolutionary theory has been refuted.

Could you be more specific in defining what "Theory of evolution" could only be falsified by disproving all the papers and supporting theories? Do you mean the idea that all life evolved from a single protocell? Or do you mean the idea that all life changes gradually as the result of variation and natural selection? If you mean the latter, I think you're right -- there are a lot of papers showing that life changes over time by variation and natural selection, and it would take a lot of work to disprove it. But if you mean the former, then explain what you mean: what papers are out there providing scientific evidence for universal common ancestry that would have to be disproven? How would you falsify the proposition that all life evolved from a single protocell? Ungtss 19:24, 21 June 2007 (EDT)

Without an answer to my question above, your argument fails. Creationists don't dispute the falsifiable, scientific, and obvious proposition that life changes over time by variation and natural selection. They dispute the unfalsifiable and unscientific proposition of universal common ancestry. Ungtss 08:10, 22 June 2007 (EDT)

See http://www.talkorigins.org/faqs/comdesc/section1.html for a much more detailed argument in favor of common descent.

According to Steven J Gould: "Darwin continually emphasized the difference between his two great and separate accomplishments: establishing the fact of evolution, and proposing a theory - natural selection - to explain the mechanism of evolution." - "Evolution as Fact and Theory", May 1981.

http://www.google.com/search?q=evolutionary.biology

http://www.biomedcentral.com/bmcevolbiol/ PerpetualAngst

But my friend, that wasn't the question:). I know there are arguments out there in favor of universal common ancestry. There are also arguments against it. But is the proposition falsifiable? What experiment could be performed to prove it wrong? That's the issue here. Ungtss 15:34, 22 June 2007 (EDT)

My original point was that there is no single potential falsification test for evolution, the same as there is no single falsification test for particle physics. For example, http://www.talkorigins.org/faqs/comdesc/section1.html gives a falsification test for each of its 29 predictions. There is no single test to falsify the proposition that all life evolved from a single protocell. Instead, you would need to refute the lines of evidence with lead to that conclusion. (See link).PerpetualAngst

I agree that evolutionists present "a number of lines of evidence that reasonably lead to a conclusion." But I submit that this doesn't comply with a meaningful falsificationism. When you have a number of different lines of evidence that "lead to a conclusion," you still have room for interpretation. For example, "I believe Joe murdered Jane because he was seen running away from the scene, covered in blood." A reasonable conclusion -- but not a falsifiable conclusion. And the reason is this: Somebody else might look at the same facts (Joe running away covered in blood), but interpret the facts differently, saying, "Joe was walking with Jane when she was murdered by somebody else, got covered in blood trying to do CPR, and was running for help when he was seen." The same facts can reasonably lead to either conclusion -- and that's why it's not science. Falsifiable science leaves no room for alternative explanations. The force of gravity is 32 ft/second squared. The earth revolves relative to the sun. The human heart pumps blood through blood vessels. There's no doubt. There's no interpretation. The answers are right up there for us to see and test. That's what falsifiable science is. The same problem applies to the "potential falsification" provided by the link you cited. Consider, for example, the section in the article you linked on "Common metabolism." They say that evolution predicts that "we will never find any modern species from known phyla on this Earth with a foreign, non-nucleic acid genetic material. We also make the strong prediction that all newly discovered species that belong to the known phyla will use the 'standard genetic code' or a close derivative thereof." But there are two problems with this. First, even if a phylum was found with a non-nucleic acid genetic material, the theory of evolution could be altered to say "Well, early in our evolution, life evolved two different types of genetic material by variation and natural selection." Second, a common genetic code is consistent with creationism -- a creationist could say "God just used a common genetic material in all life." In other words, falsifying that prediction would only alter, not discredit, evolution; and the facts as we observe them are consistent with both creationism and evolution. In sum, I submit that falsifiable science is not science where there are "lines of evidence that lead to a conclusion, but which still require interpretation of the evidence." Falsifiable science consists of specific propositions that can be specifically and experimentally tested. What do you think? Ungtss 13:09, 23 June 2007 (EDT)

falsifying that prediction would only alter, not discredit, evolution. Exactly my point: To discredit evolution would require refuting millions of data points. There is no single theorem which, if disproved, will invalidate the encompassing theory of evolution.PerpetualAngst

But even refuting millions of data points would only alter evolution. Find human bones in precambrian rock -- "Oh! Must not be precambrian rock, because there's a human in it!" No matter what findings are made, they can all be "fit into" evolution, because it's such a malleable concept that it cannot be held to account. "I cannot see your dragon!" "That's because it's invisible!" That's why I'm arguing that universal common ancestry is not a falsifiable proposition -- because it's too malleable to test. However, the experimental datapoints you mention ARE falsifiable science. Those datapoints can be interpretted any number of ways with respect to the origins of life, but the datapoints themselves require no interpretation. Science has nothing to say (yet) about how life originated. But it has a lot to say about how it works today. Ungtss 15:27, 23 June 2007 (EDT)

Falsifiable science leaves no room for alternative explanations. I disagree. No science is absolute, including the theory of gravity or the theory of evolution. Nor do they claim to be. Any competing theory must explain all the observations and data points, at least as well as the original theory, and in a manner which is consistent at every level. The objective of science it to reduce the margins of error as much as possible.PerpetualAngst

I think that your point of view is exactly what Popper (and earlier creationist proponents of falsifiability, like G.K. Chesteron) was arguing against. It's always possible to come up with alternative explanations that completely explain the data points as well as the original theory in a manner which is consistent at every level. "Gravity is caused by little invisible strings on every object, and a little gopher named George is pulling them down at exactly the same rate." It explains the facts. But it's not testable. So it's no better than any other nonsense we can concoct. Just because you can hypothesize an explanation doesn't mean we can TEST it. And until you can TEST an alternate explanation, it's no better than any other crazy explanation I can come up with. Ungtss 15:27, 23 June 2007 (EDT)

What is the force of gravity on the mars? How do you know?PerpetualAngst