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5/8/2019

Insults, Funerals, and the Progress of Science

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I once attended a science meeting where one of the attendees was proposing the existence of a new metabolic pathway that was not recognized by the prevailing thinking in the field. After he presented the evidence for his pathway, in the next talk one of the other researchers presented the evidence against the existence of such a pathway. This second researcher then concluded his presentation by raising his voice and stating that he considered the proposed new pathway to be: “COMPLETELY IGNORABLE!” while he slammed his hand flat on the lectern once during the word “completely” and again during the word “ignorable”.
 
The above story is not an isolated incident. Many fields of science have had their share of controversy often accompanied by vitriolic long-running feuds among rival scientists that seemingly resorted to using science, not as a method to discover the truth, but rather as a platform to hurl insults. And the situations that stir the most passions arise when conventional wisdom is challenged: the more revolutionary the idea, the more the attacks rain upon its proponents.
 
There are quite a few examples of these occurrences in the history of science, but I want to mention three here.
 
I have already cited the case of the American neurologist and biochemist Stanley Prusiner who in 1982 proposed the existence of an infectious agent made exclusively of proteins (no DNA or RNA), which he christened Prion. He was vilified in public and private by other scientists, but persevered and eventually won the Nobel Prize in 1997.
​
PictureDan Shechtman
Another case is the one of the Israeli scientist Dan Shechtman who discovered a new type of crystal that did not conform to common rules that crystals followed according to the field of crystallography. When he published his findings about these “quasicrystals”, the negative reaction to his discovery was so strong that the leader of his research group asked him to leave the team for bringing disgrace to it. Shechtman was ridiculed and lectured about the basics of crystallography by other scientists, and the famous two-time Nobel Prize winning scientist Linus Pauling famously stated that “there are no quasi-crystals, but quasi-scientists”. Shechtman eventually prevailed and was awarded the Nobel Prize in chemistry in 2011.
​

PictureAlfred Wegener
​Finally, there was the German meteorologist and geophysicist Alfred Wegener, who proposed in the early twentieth century that the position of continents is not fixed, but rather that they move slowly over geological periods of time (continental drift). He was called “delirious” and a “stranger to the facts”. His theory was labelled “pseudoscience” and a “fairy tale”. New students in geology were advised by their mentors that acceptance of continental drift would hurt their careers. Through it all, Wegener kept refining his theory and answering his critics. Eventually, after several decades during which new discoveries were made regarding the spreading of the sea floor and new disciplines such as paleomagnetism demonstrated the drift of continents, his ideas were accepted and incorporated into the new theory of plate tectonics. Unfortunately, Wegener did not live to see this. He died during an expedition to Greenland in 1930.
​

Why should scientists be so hypercritical? Isn’t science about proposing hypotheses and testing them through observation and experiment? Why should proposing a hypothesis, no matter how far-fetched, be met with virulent skepticism, humiliation, and insults? This has, of course, nothing to do with the scientific method. The reasons for this must reside in human nature. To my knowledge, the exact explanation has not been pinpointed, but I believe there are two phases to this phenomenon.
 
The first phase is the short-term response of a scientist upon being confronted with an idea that upends his or her world view. During this phase it may be understandable that an individual will engage in a “knee-jerk” reaction and latch on to any imperfections in the idea in order to criticize it and its proponent. The second phase is what happens over a longer time frame of weeks, months, or even years after the idea has been proposed. This phase is the more interesting one because the short-term emotions have quieted down and scientists make calculated decisions as to what to do about the idea. The forces governing this second phase have been equated with the perception of how young and old individuals react to change.
 
It is argued that old scientists are more comfortable with established knowledge, especially if they played a role in generating this knowledge. These older individuals may view any proposal which threatens to upend the conventional wisdom with suspicion and skepticism, to the point of using their influence to block funding to perform research into the new idea, impede the publication of research regarding the idea in mainstream journals, or even hinder the academic careers of the proponents. On the other hand, young scientists who are beginning their careers may be more receptive to new ideas and more welcoming to the individuals who propose them.
​

PictureMax Planck
The physicist Max Planck once famously remarked that; “A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it.” This notion that scientific progress ultimately depends on the replacement of a new generation of scientists by another, is often humorously phrased as “science advances one funeral at a time”.
 
While there may be some truth to this, I believe this generational replacement notion is not the whole story, and may in fact just reflect the difficulty in carrying out confirmatory experiments or observations.
 
The thing at the heart of scientific progress is the ability to replicate experimental results or observations, or test an idea. If replicating a controversial experiment or observation, or testing an idea, is something that can be accomplished by one lab in a short time within current budgets, acceptance of a new idea may occur relatively quickly. This happened in the case of Shechtman, and also, although more slowly, in the case of Prusiner. Other scientists, both young and old, tried to replicate the experiments of Shechtman and Prusiner and indeed obtained the same results. On the other hand, if replicating experimental results or observations, or testing an idea, requires expensive studies that take many years and involve coordination between several laboratories and travelling around the globe, or the development of new experimental tools or even new scientific disciplines, the process may be much slower, especially after you factor in the resolution of any technical problems that may arise. This happened in Wegener’s case
 
During these longer time frames, you may have a significant dying out of old scientists and their replacement with a younger generation. If the new ideas are finally accepted, the long time frame that it took for this to happen may give rise to the notion that the idea was accepted only because the old scientists died, which may not the case.
 
Be that as it may, the scientific establishment clearly sets a very high bar for new ideas to be accepted. Proposing an idea that runs contrary to the established order is not for the faint of heart. But it may just happen that if you can put up with the insults, in the end you may persevere after enough funerals!

 
 
Photograph of Dan Shechtman by Holger Motzkau used here under an Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) license. The Wegener photo from the Bildarchiv Foto Marburg and the Max Planck photo by Transocean (Photographic company, Berlin) are in the public domain.

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