Posts Tagged ‘ Creationism ’

Thermodynamics Vs Evolution: The Grudge Match


The law that entropy always increases holds, I think, the supreme position among the laws of Nature. If someone points out to you that your pet theory of the universe is in disagreement with Maxwell’s equations — then so much the worse for Maxwell’s equations. If it is found to be contradicted by observation — well, these experimentalists do bungle things sometimes. But if your theory is found to be against the second law of thermodynamics I can give you no hope; there is nothing for it but to collapse in deepest humiliation.” — Sir Arthur Stanley Eddington, The Nature of the Physical World (1927)

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Creationists


Quick extra note, Dr. Steven Novella of the Nerurologica blog today posted a great introduction to Creationist arguments and briefly covers the “Cambrian Explosion”, I recommend you pop over there and read this interesting treatise.

Scientific Debate


No matter what the issue you can find scientists to support any view. Is this a failing of science? or is something else at work here?

First off I would like to point out that the sometimes combative nature of science is a good thing. When new data is published the the authenticity and reliability should be closely examined and criticized if found wanting. Despite public perception scientific quality assurance does not stop with peer reviewed publishing, that is just the beginning. In addition the willingness of researchers to question established knowledge is also good, this is how progress is made.

Concerning my original assertion, that a scientist can be found to uphold any view, one thing to remember is that science is performed by scientists. That may seem an obvious statement but my point is that science is not a simple monolithic block of knowledge, it is contributed to by human beings and human beings have failings. We are all susceptible to biases, some of them are cultural and some of them are a by-product of how our mind works, we are more likely to accept information that confirms our preconceptions for instance. But part of science is the effort to overcome these biases, we perform controlled experiments, we use reliable sources, we replicate others’ experiments, in short we try to remove the human component as much as possible.

All of this means that individual scientists can fall on a spectrum of how well they divorce the outcomes of their work from their personal biases. In certain cases there are those that embrace their personal ideologies in their work, they let it inform and guide the course of research. Sometimes this can be a boon, leading research to new places with novel conclusions but all too often it leads to confounding factors and unreliable data.

A contributing factor is the concept of “balance” in the media, to the point that dissenting opinions will be put forward whether or not they constitute a legitimate scientific controversy. All are presented as equally valid even though some are simply wrong. Not all opinions are equal, not all conclusions valid and not all sources reliable. Consider the Evolution vs Creationism debate, this is an extreme case and so it is easy to see that it is a political debate not one based on actual scientific conclusions. Evolution is a corner stone of biological science, in light of which everything else makes sense. Creationism arises from literal adherence to certain religious traditions. Add to this that is an almost uniquely American phenomenon and the claim that it is science based practically refutes itself.

For the public presented with these opposing view points it can be difficult to separate the real controversy from the manufactroversy, or the tendency to create a debate where none exists. The general public does not usually have the tools to uncover the true state of affairs and so is left with the impression that science is unreliable or can be bent however you wish and is therefore useless. This is unfortunate as science is the most powerful way yet devised to discover the nature of the world around us, from Neutron stars to hydrothermal vents, Dark matter and DNA, all of these things can be studied by science and slowly but surely they are yielding their secrets.

Alison Campbell Interview


Time for another awesome interview, this time with someone outside of showbiz…

As a resident of New Zealand I am naturally interested in the education of my country and especially how science fairs in the education arena and what sort of competition it has to deal with. To this end I sought to interview a local academic regarding these topics. I could not have done better than Dr. Alison Campbell, biology Lecturer at the University of Waikato in Hamilton. Alison not only runs a science themed blog but also has a hand in the Cafe Scientifique casual public science forum and aided in the writing of the revised New Zealand Science Curriculum. Without further ado, here is my interview with Alison:

[Scepticon]First off, you post a daily blog, BioBlog, hosted on the University of Waikato site, could you briefly describe the sorts of topics you write about?

[AlisonCampbell]Pretty much whatever takes my fancy – but I do have some limits! I originally began blogging because it seemed a good way to improve the support available to students sitting the Scholarship examinations (intended for top students in their final year of secondary school), & so that’s what guided what I was doing. I wrote about how to prepare for exams, why Scholarship is hard work, things like that, & also started reviewing & summarising new stories in the literature, because students at this level are expected to have quite a broad general subject knowledge.

And I talk a bit about university life, because that’s where most of these kids are headed. And also give them a bit of a feel for what I do – I want them to see me as a person, not some faceless academic in an office somewhere. I would hope that that last thing also says something about the uni in general, in the sense that its staff are real, approachable people who do actually have a life outside the ivory tower :-)

I’ve also got into writing the occasional post about what I’m reading – I love books & want to share that & let people know about good popular science books. And I also have a go at pseudoscience (& how the media deal with it) from time to time. This is partly because I’d hope that doing this will help with the Schol students’ need to develop better critical thinking skills – but also because I’m really bothered by what I see as a quite widespread & uncritical acceptance of pseudoscience in the wider community.

The limits to all this are what I impose on myself – they’re not laid down by the University. I’m very aware that what I do does offer a public face for the uni & so I don’t write anything that would reflect badly on it – no bad language or things like that. But also, I know where my strengths lie & I’m not about to start pontificating about things on which I know absolutely nothing!

[S]I understand you helped set up the new science curriculum for schools, how detailed is the curriculum and what sort of process is undertaken in it’s creation?

[AC]The new Science curriculum document is much less detailed than the one it replaces. The ‘old’ one contained quite a lot of detail, including suggestions on what students could be doing to learn about a particular topic, & how teachers could assess this. There’s nothing like that in the ‘new’ one, which sets out some very broad guidelines about key concepts at each level but leaves it to schools & teachers to flesh out the details.

It had a robust development process with a lot of consultation, & I think does reflect the outcomes of that consultation fairly well. And one of the things that I really really like about the science document is that for the first time it places understanding of the nature of science right out there at the top of things. Previously this was a ‘strand’ that was supposed to be interwoven with the ‘subject’ strands (physics, chem, & so on) & as a result often got overlooked in practice. But now students from new entrants up are expected to learn something about what science is, what sets it apart from other ways of ‘knowing’ about the world, how people do science, how to communicate & participate in science. That’s a big achievement & an essential one, given that the need for a scientifically-literate society is so pressing.

[S]Where there any points of contention with the curriculum where you felt the science needed to be defended from ideological pressure?

[AC]Evolution :-) The ‘pressure’ was in the form of feedback during the consultation process, some of it quite well organised. It wasn’t a problem among the panel, however, although there were concerns about how teachers would deal with the prominence of evolution in the new curriculum. And it is prominent – wasn’t mentioned until year 12 in the old version, but now it’s there from new entrant classes onwards. Tailored for the age & conceptual understanding of the children, but very definitely there.

[S]Concerning the curriculum feedback process and the concerns raised about evolution, was this feedback from teachers regarding broaching the evolution topic in general or were there parents or special interest groups that were actually opposed to the concept?

[AC]There was a bit of concern from teachers, expressed as individual submissions to the curriculum project’s website, mainly to do with dealing with students/communities who opposed the concept. However, there was also at least one special interest group that attempted to organise its members to put in bulk submissions opposed to the extensive profile proposed for evolution. :-)

[S]You have twice been interviewed on national radio with regard to attempts to insert creationism into our schools, in the U.S. there are laws regarding the introduction of religious concepts in the classroom. What safeguards, if any, do we have in New Zealand to ensure only science is taught in science class?

[AC]erm – I’d like to say, the curriculum document, but the ‘old’ one (still in use, the ‘new’ one doesn’t completely kick in until 2010 to give teachers time to develop resources for it) has a few gaping holes in it: it speaks of students learning about the ‘theories’ of how life developed, which leaves the door open for teachers to present the ‘theory’ of intelligent design as if it’s really science. And they would argue that they aren’t teaching a religious concept; after all, it’s a ‘theory’, isn’t it? (Not helped by a couple of confusing pronouncements from Ministry staff, along the lines of ‘you can’t observe evolution in the laboratory’.) Most teachers wouldn’t – but some would. And private schools that get no state funding can pretty much teach what they like, especially to junior students who aren’t preparing for state exams, & so you see schools teaching young-Earth creationism in science class. But I do have to add that these are a minority.

[S]In the U.S. a large proportion of the population do not accept Evolutionary Theory, this gives rise to a “grassroots” resistance to the teaching of evolution in schools. The resistance seems to also come from teachers themselves either through reluctance to be seen to be challenging student beliefs or their own ideological biases. Are these factors we should be concerned about in New Zealand?

[AC]I’m inclined to say ‘yes’. I’ve seen comments from teachers (from Auckland schools) to the effect that they avoid or minimize teaching evolution, simply because they would come up hard against the majority of students in their classrooms. And while I was involved in the curriculum writing group I had teachers saying very similar things; they were a little apprehensive about what implementing the curriculum was going to mean for them.

[S]In your experience how well is science taught in New Zealand? Are our teachers doing a good job of showing students how the enterprise of science works?

[AC]Generally it’s well taught, I think, in the sense that students get a good grounding in a lot of science concepts, & are more & more coming to get an understanding of what science actually is. Unfortunately science is compulsory in secondary schools only until the end of year 10 (4th form), which I think a pity. And I remember seeing an item in the paper a few weeks back where primary students didn’t particularly enjoy science classes (it wasn’t that they weren’t interested in science, but that they felt they weren’t getting enough of what they considered science), which is also a bit of a worry.

[S]If people are concerned about these issues what courses of action are open to them?

[AC]If I had concerns over my own child’s classroom experiences then I’d be inclined to raise them with the classroom teacher in the first instance. Followed by the HoD Science & the principal, in that order. It’s not really something that’s within the ambit of the Board of Trustees (our system being – thankfully! – different from that operating in the US). If it’s something more systemic, then write to the Minister of Education (& the shadow Minister).

[S]You, along with Dr Penelope Cooke and several others developed the Evolution for Teaching website, what prompted this, what are it’s aims and how has it been received?

[AC]The idea was to provide a resource written for New Zealanders that NZ teachers & students could use. Penny & I are both ex-secondary teachers & knew what was (& wasn’t available), and we’d also been encouraged to work on it by teachers. (I need to add that there were two other team members involved, Kathrin Otrel-Cass & Kerry Earl.) It’s been enormously well received, both in NZ & overseas: we get around 400,000 page requests a month from all over the place. And I really must get on to updating it again…

[S]You are also involved in the Cafe Scientifique science “outreach” program, what sort of feedback have you had about this and do you think you get a good cross-section of the community attending or are you “preaching to the converted” in terms of those who are already interested in science.

[AC]Funnily enough we’re just doing a research project at the moment, looking at what the Cafe ‘clients’ think of the evenings (& other things besides, like where they get their science information from). The feedback is generally extremely positive: people like the format, like the variety of speakers & their approachability/accessibility… about the only thing that’s mentioned in a negative way is the venue – it can be noisy in a pub & some of our attendees would like somewhere quieter.

We’ve got a group of regulars – the ones already interested in science – but we get others coming in, particularly when it’s a contentious or topical issue. (About 50% of those who come are involved in science one way or another.)

We also have a website, where we advertise the sessions & also mount the handouts that most of our speakers provide – I know quite a few school teachers use those as a teaching resource.

[S]With regard to the pseudoscience and culture of belief rather than evidence that seems to be growing, what do you consider to be the biggest threat(s) to rationality in New Zealand at the moment?

[AC]That whole thing about all points of view being equally valid. So that when the media run a story on a particular issue, they seem to think it essential that they present ‘both sides of the issue’. Even when, as with evolution, there really is only one side. And the almost universal lack of investigative journalism, at least in regard to science & pseudoscience. For example, take the case of an Auckland school teacher doing a ‘trial’ of the efficacy or otherwise of fish-oil capsules with respect to students’ learning (I blogged on it last week). Totally uncritical coverage in the papers. A couple of people wrote in to the ‘letters’ section of the Herald, pointing out that whatever else was going on, it definitely wasn’t science. And someone else took them to task for being boring old fuddy-duddies who wanted to take all the fun out of school science!

[S]Are there any other topics that you feel are particularly important in education today?

[AC]Some sort of crash-course for journalists?

Not really an education topic – but I’d love to see science receive greater recognition & appreciation in society. I work with the group that selects and trains the NZ team for the International Biology Olympiad competitions. And we do it on the smell of an oily rag: the total estimated costs each year are around $70,000, but we do it on a fraction of that due to donated time & materials, & a lot of fund-raising by the team members. Little or no help from the Ministry of Education, & funding bodies – such as the charitable funding agencies – simply haven’t wanted to know up until now (I understand things have changed somewhat for next year & like the rest of the group, I’m hugely grateful). Yet at the same time they’d give money to send a school sports team away… We seem to place such huge emphasis on sporting success, and yet it’s science & technology that underpin much of our economy. Scepavatarsmall

I would like to thank Alison for taking the time to answer my questions, I hope you enjoyed reading her answers as much as I did.

Read more from Alison at her BioBlog and if you live in the Waikato area check out the Cafe Scientifique home page for more sessions to come in the new year. For more information about student attitudes to science and the New Zealand National Education Monitoring Project Science assessment results visit nemp.otago.ac.nz/science/2007/index.htm, and for more on the International Biology Olympiad visit ibo-info.org.

Resources

http://sci.waikato.ac.nz/bioblog/

http://sci.waikato.ac.nz/evolution/

http://sci.waikato.ac.nz/news/Lectures/CafeScientifique.shtml

http://www.minedu.govt.nz/educationSectors/Schools/CurriculumAndNCEA/NationalCurriculum/Science.aspx

http://sci.waikato.ac.nz/staff/biol/acampbel

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E.coli Evolve


A few weeks ago in my interview with Adam Savage I mentioned the work of Dr. Richard Lenski on E.coli bacteria. Specifically the observation of the evolution of completely novel traits in the bacteria. This work is a fascinating look into both the painstaking nature of laboratory research and the evolutionary process in action. In the experiment (which has been going on for 20 years) the researchers grew colonies of E.coli on a medium that was restricted in the bacteria’s preferred food, glucose, and abundant with an alternative food source, citrate, that they can not normally metabolize. 12 separate but initially identical populations of bacteria were grown in this way and every 500 generations or so a sample of each was frozen to record the evolutionary trajectory each took through time. This situation is how things stood for over 30,000 bacteria generations. To put this number in perspective, in human generations this would take approximately 450,000 years, assuming a generational period to be about 15 years, not unreasonable for much of our history I would think. Could you imagine the patience required to continue this experiment for so long? Watching grass grow or paint dry would be interesting distraction by comparison surely. But I digress, at around the 31,500th generation something happened, one of the populations exploded due to having developed the ability to use citrate for food.

This result is not trivial, indeed the inability of E.coli to use citrate for food is one of it’s defining characteristics and can be used as a method for distinguishing it from other bacterial strains. The large amount of time it took the bacteria to evolve this trait also suggests that is not a path that is easy to take in space of all possible mutations. Further work done by Lenski indicates that it was likely the accumulation of at least three separate mutational events that lead to this outcome. This shows that how a species develops in the future is very much dependent on what has happened to it in the past, or in other words, differences in the makeup of a species constrain how it may change in the future. This may seem to be trivially true, after all, fins have to exist before limbs can evolve and limbs would seem to be the must have accessory if your going to develop wings. However to see how this is significant all we need to do is go back to one of those frozen cultures and see if we get the same result when we play it again, Sam. In fact this is exactly what was done and it was discovered that the trait only “re-evolved” after a certain generation in the population that had the fortune to innovate it in the first place.

This indicates that it is only the presence of certain other mutations in this particular bacterial line that allowed the evolution of this ability at all. And so it is by the perversity of historical accident that a population inherits the conditions upon which further moldings of the clay of life are wrought.

Resources

http://scienceblogs.com/loom/2008/06/02/a_new_step_in_evolution.php

http://www.newscientist.com/article/dn14094-bacteria-make-major-evolutionary-shift-in-the-lab.html

http://scienceblogs.com/pharyngula/2008/06/historical_contingency_in_the.php

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What is a Theory?


Just a Theory. It’s been the catch cry of pseudo-scientists and the ideologically driven who attempt to undermine the public’s perception of scientific evidence and push their own pet alternative. To give them credit, it has worked, in the mind of the general public a scientific concept labeled “Just a Theory” instantly becomes less convincing and a target of misunderstanding. Like any other word, theory has multiple meanings. You might use the word to describe the feeling you have that a particular person is responsible for you missing cookies, or why you didn’t get the raise you were hoping for. While suitable for everyday conversation this is not what is meant when scientists use the word to describe an aspect of our knowledge of the natural world.

So, what is this thing called a Theory? A Theory is more than just a conjecture or a feeling, more than something you came up with after a night out with the boys. It is a description of a particular phenomenon or group of related phenomena that is built upon multiple lines of evidence and can be tested by making predictions and verifying those predictions through experiment and observation. A Theory is not a fact, it is so much more, a theory takes facts and weaves them into a coherent whole that explains why the facts exist and makes it possible for us to point the way towards facts that may yet be discovered.

 Far from a poorly substantiated claim, for a Theory to survive it must be capable of withstanding the criticism of the entire scientific community that it relates to, which means that it must out compete other explanations by being more parsimonious, explaining more facts and making more numerous and more accurate predictions. A new theory may not necessarily replace an old one but just provide a more complete understanding of the world, for example Relativity does not so much make Newton’s Theory obsolete as provide a richer explanation and more accurate predictions. Other Theories have in contrast been completely discredited, such as those listed below.

If a Theory manages to pass the tests thrown at it then it becomes accepted as true by the scientific community at large. This then filters down to the rest of the population and in most cases becomes part of common sense. Germs cause disease? of course! The Earth goes around the Sun? everyone knows that! Mammals evolved from a group of reptiles known as Therapsids? uh, ok. The speed of light is constant in all frames of reference leading to time dilation effects and contraction of a body along the direction of movement with respect to the observer? er, sure. Well you get the point. There are Theories that almost no-one doubts the validity of and accept as true as a matter of course. There are one or two that we have more problems with, either because they are so far outside our way of thinking that we just can’t understand them or because we feel that we have such a firm grasp on how the world is that they just seem intuitively wrong.

It is sometimes offered as a criticism of science that it can never know everything and that it’s conclusions are always tentative. I reply first, that it is not the business of science to know everything, only those things that are amenable to the methods of science and second, that this is the strength of science not it’s weakness. A point of view that can never change in light of new information is doomed to stagnate and become irrelevant. Theories don’t give us the Truth, with a capital T, they provide the nearest approximations to the truth that we can currently know.

Resources

http://en.wikipedia.org/wiki/Theory

http://wilstar.com/theories.htm

http://www.livescience.com/mysteries/080521-llm-theory.html

http://www.teachersdomain.org/resources/evol07/sci/life/gen/theorydef/index.html

Examples of widely accepted Theories:

Germ theory

Plate Tectonics

Quantum Theory

Special and General Theories of Relativity

Heliocentric Theory

Theory of Gravity

Collision Theory

Atomic Theory

Cell Theory

Evolutionary Theory

Big Bang Theory

Intelligent Design – Just kidding.

Discredited Theories:

Phlogiston Theory

Caloric Theory

Geocentricism

Luminiferous Aether

Pseudoscience


Science and pseudoscience, what’s the difference? It’s not a trick question, as you approach the cutting edge of science, where the known becomes the unknown and theories become wild and speculative the line between the two can be quite fuzzy. String Theory anyone? But in general the difference lies in that where science starts with facts and observations and arrives at conclusions pseudoscience starts with a conclusion and twists fact and observation to fit. The two most common avenues to pseudoscience appear to me to be: First, when a hypothesis is retained long after dis-confirming evidence should have rendered it obsolete. Adherents of the “Vaccines cause Autism” movement would fall into this category. Second would be those who attempt to prove their own pet ideology by either conducting flawed research or by willfully misinterpreting the work of others. Creationists and Intelligent Design proponents might fall into this category.

Correctly discerning pseudoscience can be difficult, especially if it appeals to our own biases. Some things to consider are: Arguments from authority, real science shouldn’t be decided by a chosen few, rather it is the sum total of a multitude of efforts and advancements are evaluated by the scientific community as a whole and finally a consensus is reached. Insufficiently detailed references to supporting data, it is important to be able to find the primary sources that are being used to support a position so that you can read it yourself and determine if it has been correctly interpreted. Reliance on testimony, look at the quality of the references used, if they come mainly from personal experience they may not be reliable.

Finally, you may want to look at a larger sampling of the scientific community and see what they have to say about the topic or person you are interested in. There are bound to be many sides to the issue but you may pick up on the general flavour of scientific opinion. Good luck and happy investigations.

Resources

Creationism


There are two major forms of creationism,Young Earth Creationism and Old Earth Creationism as they are called. Young Earth creationists hold the view that the earth is 6,000 to 10,000 years old and created much as it is now. This includes the view that all life was created simultaneously and no major changes (eg Speciation) has taken place in the intervening time. As opposed to this the Old Earth creationists accept that the Earth is 4.5billion years old but do not agree with a strict materialistic view of the origin of life.

While Old Earth creationism may be considered a philosophical position that tries to allow room for the spiritual as well as scientific evidence, there is no way for Young Earth creationism to be anything more than a religious belief. Young Earth creationists are ideologically bound to reject the evidence for an old Earth and Universe as shown by such lines of evidence as radioactive decay, geological formations, Arctic ice records, genomic mutation rates, plate tectonics, star formation and life cycles and the cosmic microwave background radiation.

Old Earth creationists on the other hand can fall on a spectrum between a literal creation sequence up to accepting all of evolution. This puts many on a semi-equal footing with most non-theistic scientists and they avoid the trap of Young Earthers that pits them against much of modern science. Ultimately the more of the scientific consensus you accept the less of a creationist you become. For some this implies there is no room for god, but that is still a decision that evidence can not help with.

Resources:

http://en.wikipedia.org/wiki/Creationism

http://www.talkorigins.org/faqs/wic.html

http://www.natcenscied.org/ -Link edited for brevity.

http://assembly.coe.int/ -Link edited for brevity.

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