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Three internationally-recognized, world experts on the bacterial flagellum connect the dots regarding the evolutionary origin of the flagellum, and draw some compelling comparisons to the evolutionary emergence of the Bible!
Three episodes ago, Dr. Michael Behe used the bacterial flagellum as Exhibit A in his defense of the Intelligent Design proposal. Last week, we heard Dr. Nicholas Matzke, who actually does cutting edge research on the flagellum, give his understanding of the bacterial flagellum, with comparisons to claims frequently made by the ID community.
In this episode, we hear three world-leading scientific experts on the flagellum discussing the latest scientific data on an amazing evolutionary journey which seems to explain the origin of the flagellum. Those three are Drs. Matthew Baker (University of New South Wales, Australia), Mark Pallen (University of East Anglia, UK), and Nick Matzke (University of Aukland, New Zealand).
Some of the technical points they discussed include:
Altogether, the evidence starts to point to a possible scenario involving a recurring theme of gene duplication with subsequent modification of the copies, followed by selection for a useful function:
Parts of this story are more speculative than others, but the emerging picture is looking quite clear that the bacterial flagellum is the product of a long evolutionary journey. That hypothesis then prompts new research questions which flesh out the details of this evolutionary journey. There was an extended conversation about how genes/proteins can change/morph over time and take on entirely new functions …. and how this phenomenon is precisely paralleled by the evolution of language (the words loyal, legal, and lawful all have a common ancestral origin), and even of the Bible itself!
I asked our guests to comment on Michael Behe’s claim that secular scientists themselves are doing the scientific work of Intelligent Design by “doing their experiments from a Design perspective without calling it that.” Admittedly, it’s pretty hard for scientists to say anything about evolution without using wording such as “this protein/trait is designed to enable the animal to XYZ” or “this organism evolved toward being able to XYZ.” This is goal-oriented language … wording that conveys purpose, meaning, direction, guidance … otherwise known as “teleological” language. One response to this assertion was that it can also be “sloppy language,” just like humans have the tendency to refer to Earth as “her” or to a truck as “him.”
I also asked our guests if it is possible to meet the ID proponents in the middle by saying that there is indeed “a designer”, but that designer is the cell itself (which orchestrates the genetic changes) and evolutionary pressures (which select out the good stuff). One guest replied provocatively, but entirely legitimately, that if ID proponents insist on personifying “the designer” by referring to him/her/it as intelligent, then how do they explain the flagellum being so well designed to move the bacterium around through the human host’s body in order to mediate such nasty, devastating, destructive disease outcomes.
Interesting conversation indeed!
As always, tell us your thoughts on this topic …
Find more information about our guests at Nicholas Matzke’s profile, Mark Pallen’s profile, and Matthew Baker’s profile.
Episode image by Arek Socha from Pixabay.
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A scientist who specifically studies the bacterial flagellum using some of the most cutting-edge research tools clears up a few myths and misconceptions.
Much of Dr. Michael Behe’s defense of Intelligent Design rests on claims made about the bacterial flagellum. It certainly has become his signature, and one could even say it’s become the symbol or mascot of the ID movement (like the polar bear became for the global warming movement). Some of his claims are often challenged by opponents of ID. To shed some light on the subject, we reached out to several scientists who actually work with the bacterial flagellum (Behe does not). Here, we speak to Dr. Nicholas Mitzke, who gives us a basic introduction to this bacterial machine, demystifying it and clearing up some misconceptions that have been built up around it. Points that we discussed included:
As always, tell us your thoughts on this topic.
To learn more about our guest expert, visit his faculty profile page.
If you enjoyed this episode, make sure you’ve listened to our interview with Michael Behe (or listen to it again, now that you’ve been informed). Also, if you haven’t already heard the other episodes in this mini-series, you might benefit from our basic introductions to how genes and proteins work.
Episode image by Raman Oza from Pixabay.
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Most people don’t know: the genome is a formatted database with read/write memory systems which can reorganize itself to produce new species.
This is a re-release of an episode we put out almost two years ago. In the episode that preceded this re-release, and which set the stage for this interview, we had given a thumbnail sketch of genetics as most people understand it. We distilled that common understanding into five basic statements, and showed how most people think new species (or new cellular machines, like flagella) somehow arise from genetic mistakes and accidents. And we said we would be talking to Dr. James Shapiro, a world-leading geneticist with 60 years of experience in the field and who co-leads a large group of world-leading scientists working to correct this fundamental misunderstanding of genetics and evolution, in order to fact-check that common understanding. It turns out, it’s not just outdated, but deceptively wrong!
Here’s what he told us about those five basic statements.
Fasten your seat belts!
(1) it’s all about DNA: who you and your children are is all completely determined by your DNA;
Your brain cells, muscle cells, blood cells … and all the other cells of your body … have exactly the same DNA; and yet they’re so very unique in many ways! What makes them different from each other — and you from anybody else — is determined largely by another molecule: RNA.
(2) DNA is a long molecule which gathers together many genes, like beads on a string, which code for the proteins that your body is made of;
Only a very small fraction of your genome (the total collection of all your genetic material) codes for proteins; just a few percent in fact. Most of the rest of your DNA codes for RNA molecules which regulate the entire genetic machine. Also, any given “gene” (discrete chunk of information) is not like one of those beads on the string: instead, it has bits and pieces scattered all over your genome.
(3) cells do everything they can to protect those genes from any kind of change;
In fact, your cells have built-in mechanisms which do the exact opposite of that: they actively change the organization of your DNA, in response to evolutionary pressures, by:
– moving large chunks from one position to another, even between chromosomes (recombination and reorganization);
– moving large chunks between completely different species (“horizontal transmission”, in contrast to the standard “vertical transmission” from your parents);
– combining the genomes of two different related species to produce a new third species (hybridization) or produce an entirely different kind of organism (the origin of the mitochondria and chloroplast);
(4) UV light and mutagenic chemicals cause random mutations in the DNA, which can alter the function of the proteins they encode;
Cells have very good error-correcting mechanisms which undo those kinds of mistakes, as well as those made when the “photocopier” (the DNA-duplicating machine) goes on the fritz;
(5) those random mutations accumulate over time, producing individuals with new characteristics (e.g., blood type; hair color) and eventually … a new species;
The occasional random mutations which might make it through the error-correcting mechanisms referred to in #4 above are completely unable to explain the origin of major changes in a given species (new “phenotypes”), let alone the origin of entirely new species.
How much more wrong could we have been?
This new and improved understanding of genetics and biological evolution opens up new ways to defuse the debates which keep coming up when creationists push back on the Theory of Evolution. Or on the evolutionary origin of the bacterial flagellum!
As always, tell us what you think …
If you want to hear our summary of the common [mis]understanding of genetics, and the backdrop for this interview, check out Episode #69. As a bonus, that episode also explored nine reasons why some people push back on the whole idea of evolution (in some cases, because they just don’t properly understand genetics and evolution).
To find more about Dr. James Shapiro and the group of scholars he co-leads seeking to bring awareness to this new understanding of genetics, go to The Third Way of Evolution.
Episode image from Pixabay (and modified).
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Dr. Michael Behe, a biochemist and Intelligent Design proponent, gives us his perspective of ID, and responses to several counterarguments against ID.
To start off our deep-dive into Intelligent Design, we wanted to talk to a knowledgeable representative of that movement. Dr. Michael Behe, a biochemist who has been waving that flag for three decades now, and Senior Fellow at the Discovery Institute (“ID Headquarters”), was a great choice for this first conversation. In addition to exploring a variety of biochemical and physiological concepts, our main goal was to get his response to several counterarguments against Intelligent Design which we hear often (and resonate with).
Our points of discussion included:
As always, tell us your thoughts on this topic …
If you haven’t already heard the two episodes that preceded this one (Episode #130 and #131), you really should: they’re all part of a mini-series we’re doing on Intelligent Design, and they set the stage for this one. You may also like Episode #70, where we talked to Dr. James Shapiro (an Emeritus professor with decades of hands-on experience with genetics at several world-renowned universities) about how cells routinely move large chunks of DNA around.
To find out more about Dr. Michael Behe, see his website or his page at the Discovery Institute.
Episode image: Ciker Vector Free Images from Pixabay.
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Before hearing from Intelligent Design advocates, we thought we’d give our listeners some useful background information about how cells work …. it turns out it’s all about making shapes out of string.
Before we present our interviews with Drs. Michael Behe and Jonathan McLatchie (both leading proponents of Intelligent Design), we feel we should give our listeners a quick Cell Biology 101 to explain some of the concepts that will frequently come up in those interviews, and which easily mislead non-experts. So, in this episode we’ll talk about how cells make proteins, and how it’s the sequence of amino acids (which is directly decoded from the gene sequences) which determines the 3-dimensional (3D) shape of the protein, and that in turn gives the protein its functionality.
In this casual conversation, given at a NON-EXPERT level, Scott and I talked about:
As always, tell us your thoughts on this topic …
If you enjoyed this episode and/or if you want to learn more about the genetic aspects of this discussion, you should check out Episode #70, where we talked to Dr. James Shapiro (an Emeritus professor with decades of hands-on experience with genetics at several world-renowned universities) about how cells routinely move large chunks of DNA around.
Episode image by Milada Vigerova at Pixabay.
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A short introduction to start a mini-series on this Christian apologetic idea, and some of the reasons why we have such difficulty with it.
Intelligent Design” has attracted much criticism — certainly from the secular, scientific community, but even from Christians of all stripes … including ourselves. Over the next few weeks, we’re going to talk to some of the most prominent advocates of this controversial idea …. as well as to scientists who are the world experts in the areas on which those advocates build their pro-ID arguments. But before we do that, we thought we’d re-release an episode that we recorded three years ago, which introduces this controversial idea and sums up many of the reasons why we find it so hard to fully embrace it.
Our main stopping points in the discussion included:
As always, tell us your thoughts on this topic …
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“Why not just throw the worship service out the window, and re-think what it means to be a Christian community?”
Most Christians today have nestled into, or hopped between, a very standard modern expression of Christian faith, one that involves meeting for an hour on Sunday and having an unchanging mixture of songs, scripture reading, announcements, sermon, and prayer. Many people are leaving churches, and even Christianity itself, because it just doesn’t meet their spiritual needs.
Today, we talk to Dr. Evan Amo, who did theological training at Princeton Theological Seminary and after a few traditional conservative Christian pastoral placements, asked: “why not just throw the worship service out the window, and just re-think what it means to be a Christian community?”
Here are the main points in our conversation of his spiritual journey and his own answer to that question:
As always, tell us your thoughts on this topic …
Find more information about Evan’s new way of “doing church” at their website or Instagram account, and his music at www.bruisedreeds.bandcamp.com.
If you enjoyed this episode, you may also like Episode #115, where we talked with Dr. Gregory Mobley about interfaith learning and finding God in unconventional places.
Episode image by permission from Dr. Evan Amo.
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Four particularly toxic ingredients make it especially hard for some (many?) Evangelicals to maintain their belief system beyond a few decades.
Christianity, in the West at least, is certainly experiencing a “great falling away”: churches closing, memberships dropping, people leaving the faith entirely. Some might conclude they’re leaving in order to better enjoy “sex, drugs and rock and roll.” But a closer look reveals that their departure has so much more to do with simply being unable to hold on to something that just produces so much doubt, internal conflict, cognitive dissonance, and challenges to personal integrity. And a variety of forms of religious abuse have certainly helped people out the doors.
We certainly found this to be the case for the four of our listeners whom we interviewed over the past four weeks. We learned that all four of them have rejected the form of Christian faith that they grew up with and held quite comfortably for a couple decades. Two of them no longer go to church at all, while a third one attends as an atheist. And none of them would again embrace the label “Evangelical.” But all four are still always listening, reading and talking about ….. Christian things. They’re still “scratching the itch”! In this episode, we distill some themes, commonalities, and lessons learned from those four conversations. Points that we covered include:
As always, tell us your thoughts on this topic …
If you enjoyed this episode, you may also like Episode #14, where we first talked about four core problems with Evangelicalism. More specific points that we skimmed over were discussed in greater detail in episodes #19 (Penal Substitution), #42 (“personal relationship”), and #88 (Hell).
Episode image from Pixabay.
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A traumatic experience while serving in a church led to a complete deconstruction of her Christian faith: she’s still “a hopeful Christian agnostic” who finds Jesus’ message “beautiful and life-giving”
Another one of our listeners tells her story. Rachel Sanders also grew up in a conservative Evangelical home, and went to a Southern Baptist church, but it was her years in Christian elementary, middle and high schools, and then a Christian college which really instilled in her a Fundamentalist Christian worldview. For a couple decades, she was quite comfortable in that faith system; doubts and questions rumbled in the distance, but she was able to keep the cognitive dissonance suppressed. Until she and her partner began ministry work in a church out of state. An escalating series of clashes and confrontations with members of the congregation and the pastor led them to not only leave that church, but then triggered a full theological deconstruction. That storm shipwrecked her faith! She now calls herself a “hopeful Christian agnostic,” because she still finds the message of Christ to be beautiful and life-giving. But for now, returning to a church, even as just a pew-warmer, is out of the question.
Some of the points we talked about with Rachel include:
As always, tell us your thoughts on this topic …
If you’re interested in other personal life stories of people we’ve interviewed, check out this thematic collection.
Episode image by Tim Hill from Pixabay.
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Her spiritual journey was going perfectly well, until life circumstances blind-sided her and the “body of Christ” failed her, putting an end to her journey.
This week, another long-standing member of the podcast discussion group drops into our “studio” and shares her spiritual journey. She was perfectly comfortable for the first few decades with her very Conservative Fundamentalist Evangelical upbringing, fully accepting all of that theology without question. But when tragic life circumstances led the people closest to her — “the body of Christ” — to betray and abandon her, that’s when the deconstructive questions really began. Not only did those relationships unravel, but so did one theological tenet after another. A few decades later, she’s really not sure what she can believe or trust anymore. And yet she’s still “scratching the itch”.
Our discussion covered the following points:
As always, tell us your thoughts on this topic …
If you’re interested in other personal life stories of people we’ve interviewed, check out this thematic collection.
Episode image by Tarek Darwish from Pixabay.
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