How to tell the difference between Science and Pseudoscience: A presentation by Massimo Pigluicci

Today I attended a lecture by Massimo Pigliucci at Washington University in St. Louis. The title of the talk was "A Fresh Look at the Demarcation Problem and Why it Matters." Pigliucci’s aim was to help us distinguish between real science and pseudoscience. He offered some a few examples up front to set the stage. It is fairly well accepted these days that Freudian psychoanalysis is pseudoscience whereas Einstein's theory of relativity is a prototypical example of legitimate science. Most science falls in between these endpoints. One example of a suspect science is string theory, which Pigliucci characterized as a favorite modern day "whipping boy." Karl Popper had the same objective back in the 1930s, offering his falsifiability approach: a theory should be considered scientific if, and only if, it is falsifiable. Not only did Popper believe that he had provided a method for determining what is truly scientific; he also believed that he had solved David Hume's “problem of induction.” Induction is the process of generalizing from a smaller set to a larger as-yet-unobserved set; the induction problem, according to Hume, was that we cannot rationally justify induction, because this conclusion depends upon the assumption that nature will continue to be uniform. Pigliucci argued that Popper's falsification approach is not sufficient for it distinguishing between pseudoscience and science, because it is “vulnerable to the Duhem-Quine theses.” The problem, according to Pigliucci, is that one can often save a falsifiable hypothesis by tweaking it (as nineteenth century astronomers did when they worked to save Newtonian physics in light of the perturbations of Mercury by positing that there was an as-yet-unseen planet closer to the sun, a planet they named "Vulcan." It would also seem that there is another problem with falsifiability; some nascent fields don't yet have a thick collection of observations with which to work. Imagine that Aristotle announced the theory of general relativity, far before Einstein. It might have been impossible for him to offer a way to falsify his theory back then, but not because there was any problem with the theory itself; it would thus be declared to be not-science. Pigliucci addresses this situation (see below). Throughout his lecture, Pigliucci referred to Larry Laudan's approach to the demarcation problem. Laudan has argued that the demarcation problem is "uninteresting and intractable," urging that we should completely stop using terms like "pseudoscience" and "unscientific." Laudan argues that philosophers have failed to point out necessary and sufficient criteria for distinguishing between pseudoscience and science. He therefore considers the demarcation project doomed. Pigliucci disagrees, pointing out that it is not necessary to find necessary and sufficient criteria for distinguishing between science and pseudoscience. Pigluicci draws upon Wittgenstein's work on family resemblances. Wittgenstein had challenged people to define the word "game" in terms of necessary and sufficient conditions. It seems like an easy task, but it is not. Pigliucci refers to this exercise as "humbling." Just because we can't set out the necessary and sufficient conditions doesn't mean we don't know what a "game" is. With regard to many concepts, including "species," and, yes, "science," no boundaries have been drawn, yet we have workable ideas for what these concepts are. Wittgenstein’s observations have been recognized and expanded by modern linguists, including George Lakoff, who has labeled such concepts as “radial categories,” indicating that prototypes serve as the most typical instances of such categories. [More . . . ]

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For want of a half penny, a future was lost…

Yesterday, my son shared the video below - Neil deGrasse Tyson's "We Stopped Dreaming (Episode 1)". It took me back to childhood memories when I was inspired to be a scientist. I remember watching the Apollo launches. I think I remember listening to the Gemini 4 space walk – I was four, and my father recorded it on reel-to-reel, but I don’t remember him ever replaying it. I remember staying up late and falling asleep…thankfully to be awoken by my mother just before Apollo 11 landed on the moon. ...Skylab, ...the test flight of the Space Shuttle Enterprise. Years later, I left behind aspirations of a science career (practicalities…how much money does the average physicist make anyway?) for one of engineering, but the love of space, cosmology, NASA…all still with me…which is why what Neil deGrasse Tyson is saying in this video saddens me all the more.

I worry that decisions Congress makes doesn't [sic] factor in the consequences of those decisions on tomorrow.
Apart from the applicability of that to just about any of the current Congress's decisions, he’s dead right in this specific instance. We are not funding science. We are not encouraging and developing engineers. We are failing in educating our young people, not only in the technical fields, but in general. The Organisation for Economic Co-operation and Development’s Programme for International Student Assessment (PISA) compares 15 year olds in 65 industrial countries. From the 2009 report:
The OECD Programme for International Student Assessment (PISA) is a collaborative effort among OECD member countries to measure how well 15-year-old students approaching the end of compulsory schooling are prepared to meet the challenges of today’s knowledge societies. The assessment is forward-looking: rather than focusing on the extent to which these students have mastered a specific school curriculum, it looks at their ability to use their knowledge and skills to meet real-life challenges. This orientation reflects a change in curricular goals and objectives, which are increasingly concerned with what students can do with what they learn at school.
“…to meet real-life challenges.” Care to guess how the U.S.A. fared in the latest, 2009, assessment? You can see here for yourself, but I’ll spoil it:
  • Reading – 17th (out of 65)
  • Mathematics –31st (significantly below the average)
  • Science – 23rd
We fail. We fail across the board. We fail where it matters. I’m not sure how we will fare in the 2012 PISA, but I seriously doubt we’ll improve. Our system doesn't support it anymore. Thomas Friedman and Michael Mandelbaum, in their book “That Used to Be us: How America Fell Behind in the World It Invented and How We Can Come Back”, quote Matt Miller, one of the authors of a 2009 McKinsey & Company report titled The Economic Impact of the Achievement Gap in America’s Schools, who said
They [American students] are being prepared for $12-an-hour jobs – not $40 to $50 an hour.”
I don’t know what the answer is. I admit a selfish cop out - we home educate our children – so I don’t think often on what can or should be done; we've taken responsibility for preparing our children ourselves. Still, one simple solution seems to be to promote science, math and engineering. And we start doing that by not cutting NASA’s budget. Fat chance. How much would YOU pay for the universe?

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Everything you wanted to know about the universe, and the opposite

This is a highly entertaining and mind-stretching talk by Lawrence Krauss from 2009. The title is "A universe from Nothing," and I'm still trying to wrap my head around it. Enjoy. Here are a few of Krauss' quotes from his talk: The universe is flat, It has 0 total energy, And it could have begun from nothing. (min 40) Why is there something rather than nothing? There had to be. If you had nothing in quantum mechanics, you’ll always get something. It’s not simple. . . but it’s true. (Min 41) We live in a universe dominated by nothing. 70% of the energy in the universe resides in empty space. And we don’t have the slightest idea why it’s there. (min 42). We now know that “we are more insignificant than we ever imagined. If you get rid of everything we see, the universe is essentially the same. We constitute a 1% bit of pollution in a universe that’s 30% dark matter and 70% dark energy. We are completely irrelevant. (min. 43). There may be other universes that aren't conducive to life, and lo and behold there isn't life in them. That's a kind of cosmic natural selection. (min 46:00). [History of string theory in 10 seconds.] (min 49). Strive for cosmic humility. The recognition that we don’t know far more than we know. (min. 50). Galaxies are moving away from us at an increasing rate of speed. In 100 billion years, “all evidence of the big bang will disappear.” Scientists living then will derive a picture of the universe that is completely wrong. They will derive a picture of the universe being one galaxy surrounded by empty space that is static and eternal. Falsifiable science will produce the wrong answer. (min. 52). We live in a very special time: The only time when we can observationally verify that we live at a very special time!” (min 52). The universe remains mysterious, and that is great (min 53).

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