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It’s amazing how difficult it is to get students to define a ‘fact’

ThumbTacksOver the years, I’ve found this idea to be much more slippery than I would have ever expected prior to teaching. As a biology teacher, these distinctions are incredibly important – along with the constant reminder that even ‘facts’ are slippery, changing things. Katie Schellenberg, JD, MA offers, in her recent Edutopia article, ways to establish rules for discussion.

Her article approaches this problem broadly by establishing a number of steps. Here, I focus on just two:

From “Fact, Feeling, and Argument: Helping Students Tell the Difference

Require Evidence

Even when you are discussing hot topic issues, make sure that evidence is required. This is a classroom, not a session of psychotherapy (although it can sometimes feel like that). When discussing particularly dicey issues, remember the importance of citing evidence for every declarative statement.

Explore the Difference Between Fact, Feeling, and Argument

Each about these three concepts and instill argument skills in your students to equip them with the abilitiy to “defend” each.

For example, ask questions to clarify if the student is asserting a fact, a feeling or an argument. How do we know it is a fact? A fact is a specific detail based on an objective truth. A feeling or an opinion is a value judgement that can neither be proven nor disproven. An argument is a way to utilize facts to validate your opinions, it can be considered a fact-filled opinion.

One major difference I see between our views is the ‘provability’ and implied ‘immutability’ of facts. As I said above, I see ‘facts’ as conclusion about evidence as we see it today. I think she has a more absolute view of facts than this.

Galaxies, galaxies everywhere - as far as the NASA/ESA Hubble Space Telescope can see. This view of nearly 10,000 galaxies is the deepest visible-light image of the cosmos. Called the Hubble Ultra Deep Field, this galaxy-studded view represents a "deep" core sample of the universe, cutting across billions of light-years. The snapshot includes galaxies of various ages, sizes, shapes, and colours. The smallest, reddest galaxies, about 100, may be among the most distant known, existing when the universe was just 800 million years old. The nearest galaxies - the larger, brighter, well-defined spirals and ellipticals - thrived about 1 billion years ago, when the cosmos was 13 billion years old. In vibrant contrast to the rich harvest of classic spiral and elliptical galaxies, there is a zoo of oddball galaxies littering the field. Some look like toothpicks; others like links on a bracelet. A few appear to be interacting. These oddball galaxies chronicle a period when the universe was younger and more chaotic. Order and structure were just beginning to emerge. The Ultra Deep Field observations, taken by the Advanced Camera for Surveys, represent a narrow, deep view of the cosmos. Peering into the Ultra Deep Field is like looking through a 2.5 metre-long soda straw. In ground-based photographs, the patch of sky in which the galaxies reside (just one-tenth the diameter of the full Moon) is largely empty. Located in the constellation Fornax, the region is so empty that only a handful of stars within the Milky Way galaxy can be seen in the image. In this image, blue and green correspond to colours that can be seen by the human eye, such as hot, young, blue stars and the glow of Sun-like stars in the disks of galaxies. Red represents near-infrared light, which is invisible to the human eye, such as the red glow of dust-enshrouded galaxies. The image required 800 exposures taken over the course of 400 Hubble orbits around Earth. The total amount of exposure time was 11.3 days,

Galaxies, galaxies everywhere – as far as the NASA/ESA Hubble Space Telescope can see. This view of nearly 10,000 galaxies is the deepest visible-light image of the cosmos. Called the Hubble Ultra Deep Field

As an example of what I mean by this:

Prior to Edwin Hubble’s examination of the Andromeda Nebula, no galaxies outside of the Milky Way were known. So, in the early 20th century, one could state as a fact that the Milky Way was the extent of the (at least matter-filled) universe. Today, we see this ‘fact’ as dated and supplanted by more recent evidence.

However, our solution is the same: Require Evidence.

I’m thinking specifically about discussions that emanated either from our reading of Neil Shubin’s “Your Inner Fish” or just the way that I commonly discuss molecular biology, which adheres pretty closely to Theodosius Dobzhansky’s central thesis from, “Nothing in biology makes sense except in the light of evolution.” The American Biology Teacher, March 1973:

Are theological principles facts? What about when they are brought up in the classroom as alternative “theories” of life? Interestingly, when I’ve asked for support for these ideas, I’ve been presented with Ken Ham‘s extensive publications for ‘Answers in Genesis.’

Honestly, I could have gone on all semester with this discussion if I had the time for it. This student introduced such a cornucopia of ideas to run with:

  • What is a reliable source?
  • What is good science?
  • What is evidence?
  • How do we interpret evidence?
  • How do we compare or decide between competing interpretations of the same data?

My head almost exploded in excitement about getting down to brass tacks. Fortunately or unfortunately, these ideas have been discussed ad nauseam over the years. On the one hand, a wealth of data was easily found to support or refute any number of claims, on the other, it was impossible for this discussion to ever find new ground.

In the end, we discussed evolution and creation for longer than I think is strictly appropriate in a science classroom, but I felt the conversation was justified in the sense that my students could benefit more from learning about how science is done than they could from knowing details of Kreb’s Cycle (but don’t worry, I taught that too).

If any of you reading this are teachers, have you had these conversations before (not necessarily about evolution, but just about separating opinions from theories, and how to form valid and true arguments, etc. )? If so, please let me know here what you discussed and how it went. I’d love to hear others’ experiences.

 
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Posted by on August 20, 2015 in Uncategorized

 

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I Think… but I do not Know

Darwin, wrote in his ‘B’ notebook in 1837,

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And in one instant transformed the way that we all think about life on earth. This simple diagram unified science. It captured Linnaeus’ nomenclature and married it to the fossil progressions that geologist the world over were seeing in the rocks. It redefined how we understand species and laid the framework for a new view of life as being all related at some level, with some organisms sharing more characteristics with their closer relatives and less with those more distant. It allowed scientists more than a hundred years later to recognize that the biochemical foundations of bacteria and yeast and drosophila and humans were all the same. Because we are fundamentally one family. There was no need to identify a genetic code for each species. Instead, we share a common (universal) code of DNA triplets each calling for an Amino Acid in building proteins.

However, there has been a lot of thought about what it really does mean to be a species. Darwin’s book, The Origin of Species, addresses just this point. I raise this question on the first day of my general biology class and my microbiology class. In general biology we eventually rest on the idea that, at least in the larger plants and animals we are used to encountering – and will discuss in the course of our class, the ability to mate with, and produce fertile offspring from is necessary and sufficient to group two animals into the same species. Of course the mule comes up as a near exception necessitating the ‘produce fertile offspring’ clause, but this is a definition we can accept. In microbiology, we are forced, by the nature of the organisms we study, to discard that convenient description. Many micro-organisms replicate asexually and are capable of transferring genes horizontally.

thrashing fish
knowing they’re in a bucket
and not knowing

          -Issa 1819

In the November 1 issue of The Scientist, Axel G. Rossberg, Tim Rogers, and Alan J. McKane tackle the very existence of ‘species.’ Therein, they acknowledge the fact that we use the concept of ‘species’ for our own convenience and consider the possibility (or rater, probability) that the very idea of species delineation may be artificial. The article looks into the variety of life and how the definition must change depending upon the organisms in question and makes us face the assumptions we often take for granted. Click on ‘The Scientist’ below to see the full article.

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                Link to the article in The Scientist

 
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Posted by on November 27, 2013 in Uncategorized

 

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Organizing next semester

Next semester will bring a new course. one I’m calling Ecology, but presently, only one half Imageof the class appears to be ecology, while the second will cover molecular biology and topics of Biotech and Recombinant DNA Tech.

We will be using E.O. Wilson’s 1971 text, Primer of Population Biology as a primary source of material in the first unit, so far I’m not sure what to use for the second unit. 

 
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Posted by on September 18, 2013 in Uncategorized

 

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This Week in MicroBiology Class

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Jaundice

Instead of starting our chapter on Eukaryotic micro-organisms / parasites, we spent much of Thursday’s class discussing the second Chapter of ‘Vaccinated’. This chapter digs in and discusses how a number of vaccines were tested in the children of the Willowbrook institution in New York. We talked about how researchers must balance the (sometimes) competing interests of doing the best experiments to answer a question and looking out for the interests of those who can not look after themselves (the children of Willowbrook, in this case).

This chapter looked at the work of several investigators; Most evaluating vaccines, but one (Krugman) was also doing experiments to investigate how Hepatitis was spread. His work included the infection of a number of children with live virus, but no attempt at protecting them from infection.

This is presented as the most condemnable work of the lot as it presented no potential benefit to the children. In saying this we define the principle by which other work was done, ‘does the study do no intentional harm and does it provide at least some potential benefit to the subjects?’

This principle provides a challenge to doing the (scientifically) ideal experiment outlined below.

A basic, direct vaccine test would divide patients into two groups (vaccinated and unvaccinated) and then challenge half of each group with live virus (or whatever the vaccine is to protect against).

Ideal results:

vaccinated –> unchallenged –> 100% healthy

vaccinated –> challenged –> 100% healthy

unvaccinated –> unchallenged –> 100% healthy

unvaccinated –>challenged –> 100% sick

However, this means that the researcher would be knowingly (assume s/he is not blinded) injecting unprotected patients with live virus – an obvious ethical issue.

In looking through some old work done to investigate how hepatitis is spread, there was a mention of work conducted in just such a manner:

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Bellin and Bailet J. Ped 1952

It’s unclear from this reference to a personal communication what, exactly the word ‘volunteer’ means.

I’ll bring up this paper in class the next time we discuss Vaccinated. I have an interesting person connection to it.

Instead of a experimentally controlled challenge, modern vaccine tests (as the other work described in this chapter) use much larger populations chosen because of their ‘at risk’ nature and then we wait and see if there are statistical differences between the infection rates of each group.

 
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Posted by on September 6, 2013 in Uncategorized

 

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first day jitters

Yesterday was the first day of my Bio and MicroBio classes for the Fall semester and I’m trying some new things including using iPads as clicker devices and media delivery. I’ve had some problems moving my iBooks onto the devices, but with some help from Apple’s technical services, I hope to have that worked out soon.

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Won’t get Fooled Again

One problem I did stumble into was getting used to the eClicker interface while trying to keep my cool at the same time. Worse, in my fluster I confused the approach of 11 o’clock with 12, and rushed my way into ending class a full hour early.

in the event that anyone reading this is a student in my class, I want to mention that I would like you all to read the first chapter of the textbooks and write out the end-of-chapter questions (MC&TF for Micro, Testing Yourself for GenBio). You should also read the first chapter of the complementary book by Thursday, Aug 29.

All in all, I think everything went fine and I’m eager to get working on core material in the coming classes.

 
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Posted by on August 21, 2013 in Uncategorized

 

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Project One of my Game Development Class made my head explode

I’m taking an intro Game Development course online (it’s well known that I hate online courses in general) and here I am on what amounts to day three and I’m struggling.

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Do this Stuff. Don’t worry, it’s easy.

Instructor:”So, you just need to make up this data tree thing with nodes and identifiers and stuff… look, just do it and get back to me. Here’s an outline:

  1. Each node has an ID property which is unique number identifying the node
  2. Each node as a Report() method that will print to the console it’s ID and if its a leaf or not
  3. When created, the tree has a single node, the root
  4. The tree has a SplitLeafs() method which will cause all leafs to create two children
  5. The tree has a VisitAll() method which will visit every node and call the node’s Report() method
  6. The tree has a LeafReport() method which call Report() on just the leaf nodes
  7. In your main() method in Program.cs/Main.cs, you have the following:
    1. Create a tree
    2. Call VisitAll() on the tree
    3. Call SplitLeafs() on the tree
    4. Call LeafReport() on the tree
    5. Call SplitLeafs() on the tree
    6. Call VisitAll() on the tree”
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OK…

Me: “Um, OK. I don’t really know what this is, but if you say it’s easy, I’m sure that I can figure it out.”

 

Instructor:”Got it yet?”

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Arghh!!!

Me: “Arghh… Let’s see: Tree class and Node class… How do I instantiate these things?

The root has no parent, but has children…”

Instructor:”Yeah. You totally have it. Let’s talk about the completed project tomorrow.”

Me:”Oh crap. So, the tree just gets made once, but then it makes the nodes…? Each node will hold some data: let’s keep that simple. Make it an integer.

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What the hell’s a leaf?

Ughh. Simple isn’t simple enough.” 

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Feeling the heat now?

Instructor:” A leaf if just a node. It has a parent, but no children.”

 

Me:  “And, how to we do this splitLeaf thing?”

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Cripes! instantiate two children from each leaf….how… to…?The pain!

 

Instructor:” Look, it’s just a couple methods within the class. write up a couple setters and a couple getters and then one or two other methods to do the work.”

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Look, I don’t mean to tighten the screws or anything, but this needs to be done and uploaded onto the Google+ document space…

 

 

I’m not kidding. I went from dominating my into C++ class to being a joke in this next class. I’ll try to  deconstruct the problem and post a walkthrough of the general idea if anyone’s interested.

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Google+? Wha…..

 
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Posted by on June 20, 2013 in Uncategorized

 

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Tuesday Classes

Again, it looks like a major winter storm is coming in just in time to cancel class for tomorrow. We’re under a winter storm warning with the expectation of significant snow accumulation:

from NOAA

Updated Feb 25, 2013, 8:10pm CST
… WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 PM CST TUESDAY…

A WINTER STORM WARNING FOR HEAVY SNOW REMAINS IN EFFECT UNTIL 3 PM CST TUESDAY.

* TIMING… LIGHT SNOWFALL HAS BEGUN LATE THIS AFTERNOON AND WILL CONTINUE THROUGH THIS EVENING AND PERSIST THROUGH THE DAY TUESDAY. THE HEAVIEST SNOWFALL IS EXPECTED LATE TONIGHT AND TUESDAY MORNING. THE SNOW IS EXPECTED TO GRADUALLY DIMINISH BY TUESDAY AFTERNOON.

* SNOW ACCUMULATIONS… WIDESPREAD AMOUNTS OF AT LEAST 6 TO 10 INCHES ARE EXPECTED THROUGH THE WARNING AREA. HEAVIER AMOUNTS OF UP TO 12 INCHES ARE EXPECTED FROM THE SOUTH SIDE OF KANSAS CITY EASTWARD THROUGH CENTRAL MISSOURI. THE HEAVIEST AMOUNTS ARE EXPECTED TO BE FROM THE SOUTH SIDE OF THE KANSAS CITY METROPOLITAN AREA EASTWARD INTO CENTRAL MISSOURI… GENERALLY ALONG A LINE FROM PAOLA… KANSAS TO HARRISONVILLE AND SEDALIA… MISSOURI.

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Posted by on February 25, 2013 in Uncategorized

 

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Your Inner Fish – Chapter 1

tiktaalik_reconstructionThis semester, like the preceding three or four semesters, my general biology class is reading ‘Your Inner Fish’ by Neil Shubin. Every week, we cover one chapter and my students write an essay with their thoughts before we discuss that chapter in class.

Last week was our first week with this book, so I’ve just completed reading several essays on chapter 1 from my students. Overall, I’d say that the book seems to be getting a good response and at least interests most people. I’ve had a wide variety of responses with respect to accepting the author’s interpretations of Tiktaalik, his find of a ~375 million year old fossil species that shows evidence of being a transition species for the first quadrupeds to come onto land.

This is always a fun group of essays for me to read because it challenges students to consider their perception of science as a way of viewing the world. Or, perhaps I should say, ‘science, as a way of understanding the world around us.’ A scientific view of the world is actually a fairly unnatural one. It is easy to see how it is even evolutionarily disadvantageous to have a scientific view of the world. If you have been a victim of a crime (you imagesget mugged walking down a city street) don’t you always expect that crime to happen again? It doesn’t matter that this happened only once out of thousands of times you walked the same route home, you now feel convinced that this is dangerous and are more alert and cautious. You may even find a new way home. And who would blame you? We’re programmed to look out for our own safety. This often means over-exaggerating  our fears and assuming the worst. It also means that we will now overestimate the real danger.

The other thing this discussion brings up is: what does science do for us?

The answer is supposed to be, ‘it enables us to learn from the past and have a better ability to predict the future.’  We can make predictions about things if we closely observe the world and learn its laws. The corollary to this is, if you can’t learn from the evidence you see about you, how can you ever know what to expect from the world?

All of these are interesting questions. All of them challenge how we look at the world, what we take for granted and what we can expect to get from our experiences. I’m really looking forward to reading more of my students’ reflections on this text and hope that you (anyone reading this) feel free to engage in a dialog about either this book, or the questions it brings up.

 
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Posted by on January 28, 2013 in Uncategorized

 

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Brainstorming a new class

I’m not certain whether I can push this through or not where I teach, but I’m interested in designing and teaching a course on the nature of science and addressing some of the philosophical questions around science. I brought this up with my wife on the way to the airport yesterday to discuss it and we identified two central problems: What is the appropriate scope of a class like this? i.e. Should it address just a few central questions or cover more of the reach of science? Secondly, how much can I really expect students to read in a semester? Many of my students are part time and have full-time jobs and children they are managing around their academic schedules.

Let me be honest, I really want to do this course because I want to read or re-read a lot of these books and do a much better job when I have to discuss it in front of a class.

Here’s the rough draft outline of what I would love to teach in a perfect world. I’d love to get comments and suggestions about how to shape this course. More readings, key chapters of books to excerpt from the books I identified or others, etc. Also, if you’ve taught or taken a course like this, what was the reading load like?

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The Nature of Biology: A Reading Course

A Proposal for a one credit course in biology focusing on reading, discussion and writing assignments.  Student grades come entirely from written and oral discussion – no tests

Format: Meet once or twice a week for one and a half  hours to discuss readings, organize schedules and discuss writing assignments

Assignments: Ongoing discussion groups online – every student must write at least one post with a significant contribution AND at least one reply to another student’s post for each book read.

Objective: To consider the physical and chemical laws of the universe and assess how these come together to ‘create’ biological life. Also, to discuss what we know of the origins of the universe, the earth and life itself. How does science teach us to think about these things? How do we know what is real and what is not?

Structure

Unit I: The Nature of Science

  1. What makes us think that we can believe what our senses tell us? What is reason and how can we make rational decisions in this world?
    1. Something on the nature and philosophy of science
    2. How can we tell the real from the make believe?
      1. Show the scene for 2001 when Dave Bowman is running around the inside of the Discovery.

i.     “What are we seeing?”

ii.     “How is it possible that he can run continuously and keep going around in circles?”

iii.     Why do we need an explanation at all. Can’t we just accept what we see?

  1. Dawkins, The Magic of Reality
  2. Massimo Pigliucci, Nonsense on Stilts

Unit II: Physical Origins

  1. What do we know about the universe?
  2. How did it begin and how will it end?
  3. We are all star-stuff: Basic Physical and Chemical Laws
    1. a.     ____________, Carl Sagan
    2. Origin of Earth
      1. a.     The Earth, the Moon and the Solar system – some video…. What if we had no moon?

Unit III: Biology

  1. What is Biology?
    1. What makes Biology Special, Ernst Mayr
    2. Life is United
      1. Something on Evolution??? Mayr again? –or- Why Evolution is True, Coyne
      2. Craig Venter on creating synthetic life in the lab
 
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Posted by on December 27, 2012 in Uncategorized

 

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Extra Credit

You made itI’ve been asked by several of you (from my General Biology Class) whether I would consider making the chapter 33 questions extra credit since we won’t be doing that chapter in class this semester. I really do think that that chapter is important, so for those of you who are willing to o those questions, I suppose I am willing to make that worth 5 pts above and beyond the 50 total extra credit points you can earn this semester.

My only caveat is that they be done well for full credit (i.e. no omitting the question and writing out abbreviated answers). My motivation is to encourage you to actually read that chapter and learn something – make me believ it and you’ve got the points. These can be turned in up until Tuesday’s Review class – if you choose not to come to that class, be sure to turn them in at the office or email them to me before 12pm Tuesday.

Also, I should take a moment to thank you all for a good semester. I’ve enjoyed having everyone in the class and I hope to see you again in Microbiology. Congratulations for making it through the semester.

 
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Posted by on December 5, 2012 in Uncategorized

 

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