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The phrase "science was wrong before" (or variations thereof, such as "Science has been wrong in the past") is a rhetorical bullshitting technique often invoked by cranks to reject scientific consensus ranging from evolution to global warming. It usually works like this:
It is an example of the continuum fallacy.
Usually (or at least often) "science was wrong before" is used to defend the existence of a disproven phenomenon - a bit of alternative medicine, perpetual motion, crank theories of everything, faster-than-light travel...the list is really endless for where this has been applied before. The usual examples of science being wrong (like the geocentric worldview that "science" used to hold) were theories that were in no way disprovable at the time, much in the way that string theory cannot be readily disproved at this time. Many alternative medical practices on the other hand have been carefully shown to be bullshit in one study after another - no additional information will suddenly invalidate these conclusions. When used like this, the "science was wrong before" trope is effectively like suggesting that our observations that gravity is an attractive force are wrong, because one day in the future we might just see something go floating up instead of falling down, and therefore homeopathy works.
So while it is true that several believed-to-be-true theories turned out to be wrong, that doesn't mean that theories that have already been proven wrong might suddenly turn out to be right.
 Missing the point
The logic behind this "argument" is fallacious in a number of ways. Primarily it misrepresents how science actually works by forcing it into a binary conception of "right" and "wrong". To describe outdated or discredited theories as "wrong" misses a major subtlety in science: discarded theories aren't really wrong, they just fail to explain new evidence, and more often than not the new theory to come along is exactly the same as the old one but with some extensions, caveats or alternatives. Often enough, these "new" theories are already in existence and just waiting in the wings ready for new evidence to come along and differentiate them. For example, the fact that quantum theory doesn't explain gravity does not invalidate the Schrödinger equation or the quantisation of energy, it merely says that the current formulation of the theory is incomplete and there are modifications to quantum theory already being formulated, ready for when the next big leap in observational evidence occurs.
The fact that science can be "wrong" in this way is a feature, not a bug, as one of the differences between science and pseudoscience is that science is self-correcting whereas pseudoscience continues to put forth the same debunked points over and over again. These pseudoscientists present "science" as a monolithic entity with no difference between different types of science and the uncertainties associated with each field. For example, an economic study of the minimum wage that uses the scientific method cannot be replicated as easily as, say, a basic chemistry experiment that can be repeated in a lab - like finding the boiling point of a chemical. Thus, the economic study may not be "wrong," but has a lower degree of certainty attached to it than the chemistry experiment. Inability to make this distinction is often the result of the failure to think in a Bayesian fashion, in which the subtleties of errors are more accurately appreciated. Thus the "science was wrong before" argument it conflates different types of errors within science, confusing incompleteness of theories with being outright wrong. This, as Isaac Asimov called it in his essay The Relativity of Wrong,, is a form of being wronger than wrong.
 Basic logical flaws
But more than just being a complete misrepresentation of science, claiming that "science was wrong before" is flawed at the basic logical level. It can be considered a non sequitur or red herring because it usually has nothing to do with the subject at hand. For example, the fact that phlogiston was wrong has no bearing on whether or not evolution is correct, and the observation that neutrinos may travel faster than light has absolutely no relevance to homeopathy, as that is already governed by a certain evidence base.
This is also a false dichotomy; someone using the argument is apparently suggesting that all of science and rationalist thought must be perfectly correct the first time or their selected woo-du-jour must be correct. Using a reductio ad absurdum, the argument can apply to any and all forms of science and technology. Therefore, there would be no way to test the validity of any claims besides "other ways of knowing". But no one would say, "I'm not going to drive in a car! Science has been wrong before!"
For these reasons, "science was wrong before" is an objection that is not even wrong, and tends to be used as a last-ditch escape hatch when the crank has run out of concrete objections or talking points.
 Uses and examples
- This canard seems to be particularly popular among alternative medicine woo-meisters, as they can easily point to any failed medication or treatment (Vioxx is one of the most commonly used, but thalidomide works well too) and say "Look, science was wrong before, so buy my quackery!" Some woo-meisters take this to extreme lengths and reject the scientific method entirely.
- Creationists usually use it in reference to the Piltdown Man—though this is rife with many problems, not least of all the fact that it was exposed by science and not by, say, creationists.
- Free energy types love it as well. It tends to play into cold fusion and other free energy suppression conspiracy theories.
- The gambit appeared when neutrinos were suspected of travelling faster than light. Homeopaths played it perfectly straight while some Above Top Secret posters seemed to indicate it would change our thinking of UFOs and other phenomena.
 Failing at even being fallacious
Oftentimes, extremely factually challenged (or intellectually dishonest) cranks will spin an urban legend, myth, or misinterpretation of a historical event as a case where "science was wrong before."
- "Science was wrong before" is often found alongside the Galileo gambit. The obvious problem here is that Galileo was persecuted by the Catholic Church, not by "science".
- In many cases, old theories were not proven wrong, but only shown to be incomplete. For example, the discovery of quantum mechanics didn't prove classical or Newtonian mechanics wrong, but it did show that classical mechanics did not hold true in every case.
- A common talking point among global warming deniers is the so-called prediction of "global cooling" in the 1970s. There were in fact scientists who argued for global cooling; however, a survey of the literature as a whole shows that the majority of papers published even back then argued for warming.
- Paul Ehrlich's The Population Bomb is often invoked to handwave away any concerns about overpopulation or sometimes even all environmental issues.
- Anti-environmentalists in general love to abuse this gambit. Need to write a good denialist tract on global warming? Dig up old denialist literature on any recent environmental problem (acid rain, DDT, ozone depletion, take your pick) and use it to announce that "science was wrong before." Anything by S. Fred Singer should do the trick.
 Realism versus anti-realism in science
While "science was wrong before" is most often used in service of science denialism, it could be considered an (extremely) naive form of the anti-realist position in the philosophy of science. The realist vs. anti-realist debate concerns to what degree our current scientific knowledge truly represents the nature of reality. Needless to say, this debate is much more complex and nuanced than shouting "Phlogiston! Hah, where is your science now?"
 See also
- Science has been wrong before, UK Skeptics
- The appeal to "Science was wrong before", Skeptico
- Absolute Authority, Less Wrong
- ↑ The Relativity of Wrong - Issac Asimov. Retrieved June 21, 2011.
- ↑ 2.0 2.1 Gaia-Health.com - Subnuclear Particles May Move Faster Than Light. Who Says Homeopathy Can’t Work?
- ↑ A good example of this: Anti-vaccine propaganda from Sharyl Atkisson of CBS News, Science-Based Medicine
- ↑ Oh Yeah? Thalidomide! Where's Your Science Now? Science-Based Medicine
- ↑ See NaturalNews for an egregious example of this.
- ↑ Above Top Secret - An article - " 'Light-speed' neutrinos point to new physical reality"
- ↑ Thomas C. Peterson, William M. Connolley, and John Fleck. The Myth of the 1970s Global Cooling Scientific Consensus. Bulletin of the American Meterological Society, Sep. 2008, pp. 1325-1337.
- ↑ For further detail, see the Stanford Encyclopedia of Philosophy entries for scientific realism and scientific underdetermination.