First frost

Transporting plants into the greenhouse.

The temperature dropped below zero (Celcius) for the first time last Friday night. We’d put back up the greenhouse’s plastic cover, which had blown off a couple weeks ago in a wind storm, but that was not enough to save a couple tomatoes and a squash plant.

It was a good illustration of the effects of freezing on plants not adapted to the colder weather. The leaves all turned black and flopped over, probably because the expanding ice ruptured the cell walls.

It also indicates that I need to get at temperature data-logger so I can monitor the temperature inside and outside the greenhouse. In the spring I hope to start a bunch of plants inside but put them into the greenhouse at the first opportunity, but I’ll need to make sure that greenhouse can support them. The data logger will also allow for some interesting experiments.

Imagemaps with the GIMP

I’m just testing out a simple image map created with the GIMP. The GIMP is a free image manipulation software, a bit like Photoshop, not quite as sophisticated, but free. I used GimpTalk‘s very helpful guide. I though it would be easiest if I used something from a previous post as a test.

You should be able to click on the cell walls, chloroplasts, vacuole and nucleus. The links take you to the associated Wikipedia pages, but that’s just because this is a quick and dirty example. Image maps have been around for a long time, but I believe this is the first time I’ve ever created one. Now I just need to animate it a bit.





Unfortunately, this image is not easily scalable, though it should not be too hard to find (or write) a script to do just that.

Geography of Hot Springs, AK

The overlook tower in Hot Springs is a bit expensive ($7 a pop.) but offers a great view of the town and a great place to observe somewhere with the themes of geography in mind.

Hot Springs, AK.

Our bi-annual trip to Little Rock and environs could easily include a stop in Hot Springs. I swung by the Hot Springs National Park there last weekend and really liked the potential of the observation tower as a place to tie in the themes of geography. The town is small enough that you can see it all, including the reservoirs supplying it with water, from the tower. It’s something to consider.

I’ve also just noticed that the National Park Service has, on their Teachers page, a two for one deal where you can visit the Hot Springs National Park and Central High School and have your costs reimbursed. I’m pretty sure, however, that this does not include the tower.

A few things you can see.

Erosion as diffusion

Landforms in the sandbox before and after the rain.

We left the sandbox uncovered under last week’s heavy rain, and the result was a new perspective on erosion, sedimentation and the evolution of landforms.

Nice, sharp, hand-sculpted valleys were smoothed out by the raindrop splatters. The beautifully steep sided fjord on the lower left, in particular, eroded into the gentler slopes of a fluvial surface.

This process is diffusional. Sand moves from high peaks to fill in the low valley floors, evolving toward a softer, flatter land surface in the same way dye in pan diffuses from the high concentration droplet to a more uniform distribution.

There was enough rain that water pooled, for a little while, at the lower end of the sandbox. This allowed the formation of a beautiful little delta from the main river, which was most remarkable to observe while it was raining because the channel bifurcated at its mouth with running water to the left and right of the depositional landform.

Island bluffs surrounded by sandy beaches.

The standing water in the “ocean” also caused the islands to partially erode at the edges to create steep bluffs overlooking sandy beaches.

And finally, if you looked carefully at the sides of the river channel you could see where the water was beginning to cut into the banks, a little offset on either side, to start the formation of meanders.

Annotated sandbox features.

Norse pyre

Farewell It's a Fish

One of our fish has died. With permission, I’ll let Sage Beasley, the main instigator of the fish tank explain (she does it much more elegantly than I could):

A few weeks ago one of our fish died. Its name was It’s A Fish. I liked the fish. I had gotten him for a Natural world experiment and when we were done with it I put him in a tank at school with the other fish It’s A Whale. It’s A Whale is still alive and healthy. We found a religion for [It’s A Fish] (he’s Norse) and followed their ritual to send the fish into the next life. We put it in a paper boat with vegetable oil and set it on fire. We have released the fish’s spirit to where ever it goes next.
– Sage Beasley (2010), in the Middle School Newsletter.

I’ll just note that every middle school should have a sandbox/watertable.

Tree of life

One of the easiest and most elegant ways of explaining the classification of organisms, the history of life on Earth, and the relationships between different organisms is to construct a phylogenetic tree. I have a great exercise I like that takes just some bits of colored paper, string, a poster board and some thumbtacks.

To start, each student writes the Latin domain, kingdom, phylum, class, order, family, genus and species names on separate pieces of colored paper. I hand out paper in stacks and give them strict instructions not to rearrange the order of the colors. Wikipedia is actually a great resource for this because they tend to be quite reliable on this if they have the specie you’re looking for (and they have quite a bit).

Students then tape the pieces of paper together on a string, species at the bottom, domain at the top, and, one by one, tack them to the poster board. As each student attaches their string to the board they say the common name of their organism and then recite the phylogeny.

When I did the exercise on Monday, I asked the students to use the organisms they’re working on for their independent research projects so everything started with the domain Eukaria. Interestingly enough, the Wikipedia pages don’t have the domain classification, probably because they think it’s too obvious, but I had a number of kids spend quite a bit of time trying to figure it out; they probably benefited from doing so I didn’t mind at all.

Constructing the phylogenetic tree.

Classifications that are the same are tacked one on top of the other, Eukaria on top of Eukaria, Mammalia on top of Mammalia and so on, so that, as students add their parts of the phylogeny, you begin to see the phylogenetic tree. We had insects, mammals, plants and reptiles, so there was quite a nice variety represented.

After about half a dozen lineages were on the board, the procedure began to get a bit repetitive, so I started to ask students to guess, based on the common name, where the next species to go on would diverge from the rest of the emerging tree. Students seemed to like this part of it. I had started with homo sapiens when I demonstrated the procedure so it was salutary for them to see how much the other organisms differed from humans.

When everything is tacked on, you end up with a cute picture of a the tree of life that makes a cute, but awfully real looking, phylogenetic tree. Students tack their pieces of paper on the string at different distances, some much closer together than others. As a result, the final tree is looks as though it shows the genetic divergence between the different groups. It a fake, but lends a sense of verisimilitude non the less.

Memories in the fire

1

I decided that we would read our memoirs, the ones my students had been working on for the last five weeks, on our immersion trip down to Mississippi. The idea of sitting around the fire, sharing memories was just too enticing to pass up.

I was a little surprised that no one objected, or even hesitated, when I made the suggestion the week before. We’d just come in from soccer and I was trying to figure out how we’d fit the projects, the tests and the presentations into the time we had left. There was a precedent. They’d read their first stories, the ones from the orientation cycle, on our first immersion and that had worked out well because it had given us an entire afternoon to have a great discussion. They seem actually to look forward to, what’s come to be called, “Teatime with Doctor.”

“What if,” I asked, a little quietly to one of the 8th graders, who’d been on the challenge course immersion the year before and happened to be walking by, “you read your memoirs around the campfire on immersion?”

“Yes.” Declarative and succinct. I raised an eyebrow, but he just continued on his way. I was a little surprised he did not have more to say. I’m always surprised when my students don’t have more to say. My students can be quite loquacious given any opportunity, and this one in particular tended to have strong opinions that he was usually more that willing to share.

The discussion with the rest of the class took barely longer. The larger the group, the more likely you are to have people who need to think out loud, but there were unanimous thumbs up in less than two minutes.

I think that there’s some primal need that gets stirred up by even the thought of sitting around a fire and sharing stories. Of course this plan of action also fulfilled that other fundamental need of the adolescent, the need to procrastinate.

II

We get to Camp H., have lunch, and an afternoon of community building games. Lamplighter’s been working with the camp leader here for years and Ms. A’s impressed by how well this group works together. No surreptitious sabotage, no subtle denigration, no stubborn unwillingness to participate.

We talk about the group, she and I, as we walk back to the cabin, red gravel crunching under our feet, oak leaves turning color overhead, and myself getting slightly out of breath on the last climb. I’m perhaps a little more impressed than she is because I can see the conflict in those by now familiar faces; glimpses of of baser instincts being overruled by the prefrontal cortex. It is a sight that is ambrosia to the middle school teacher.

I get back to our cabin and I find V., one of the two students I’d promised they could get the campfire going.

“Are you guys getting the fire started?” I ask.

“We’re just going to play football for a little while, then start on the fire,” he replies. V’s been our main supervisor for Student Run Business this cycle and it shows. He’s been breaking out his calm, clear, confident, supervisor voice on the challenges all afternoon.

“We have half an hour until dinner and it will probably be dark afterward,” I say.

He just nods, seething competence.

It’s 5:45 and they’re still playing football. I look at my watch more and more frequently. I’m not going to remind them of what they have to do. We’re Montessori after all.

Two of the girls start working on the fire pit. Aha, I think to myself, this is going to get interesting. I saunter outside and my path nonchalantly takes me down to the fire pit. I suggest more kindling, they never get enough kindling. The boys realize other people are working on “their” fire.

Dissension in the ranks. Conflict. I tell them they should work together. Harsh words are spoken. A covenant broken. The poignant cry of impassioned idealism, “injustice”. Things fall apart; the center does not hold; Bethlehem is apparently somewhere on the other side of the playing field.

Ten minutes later it’s time to go to dinner, but first it’s time to rebuild, time to remind them of the covenant they came up with that very afternoon, time to have a short, quiet talk about the use of language.

Over dinner the laughter starts up again. I’m at the other table with Ms. A and her family, all of whom work at the camp in some degree or the other. After the last fifteen minutes I’m extra impressed by the calmness of her teenagers.

When we get back to the fire pit the laughter is perhaps a bit too loud, but the group seems back together again. The fire is started without recrimination (eventually because they did not have enough kindling).

We sit around the fire, reading stories, finding issues, being helpful writing partners, and learning how important it is to be critical, brutal even, to our own work. There are some really good writers in the group, and there’s nothing better than learning from your peers.

“Can we put our memoirs in the fire when we’re done?”

“Sure,” I say. Sharing our writing is supposed to be a celebration. Something strikes me as just about right about liberating these memories in flame, letting them take on a new, ethereal life. Burning pages in dancing flame, marking the putting away of cherished, childhood things; an adolescent rite of passage.

As the last few stragglers work on putting out the fire I sit there, on a cool fall night, thinking about cycles and the seasons. I wish I was on the beach, watching the tide come in, small waves advancing and retreating, bigger waves pushing them farther from time to time, every time a little closer to where they need to be.

Gardening versus frozen food? A little controvercy

Adam Ozimek stirred some controversy last month when he suggested that, whatever the educational merits, if the objective is to get inner-city kids to eat better, then we should be teaching them how to cook delicious meals using, cheaper and almost as nutritious, frozen vegetables, and not get into the slow-food, organic, locavore ethic of the Berkley School Lunch Initiative

Ozimek may have a point from a very strict utilitarian position, but he misses the big picture so badly that even if his fundamental argument was not wrong, which I think it probably is, it would be moot anyway.

First off, leaving aside the other educational merits of the program seems to miss the point. Humans, adolescents, education, these are all complex systems that interact in surprising ways. Students’ motivation to cook something they grew, for themselves, in the garden, is orders of magnitude different from the interest in cooking something out of the freezer section. And they miss everything they learn from gardening itself.

Using organic gardening methods and purchasing food, to the best of their ability, from local sources brings everyone’s attention to important environmental issues that situates students in the global ecosystem, which is something I know I spend a lot of time trying to accomplish. We’re not trying to make students aware of environmental issues because of some insidious “progressive” political agenda. The issues are there irregardless of the differing political approaches to dealing with them.

I also have a problem with the argument that frozen vegetables are the best way to deal with nutritional issues. From an immediate perspective Ozimek is probably right, and I’d support making sure frozen veges are an important part of the program. But the slightly bigger, slightly longer term, picture is that the program successfully increases awareness of healthy nutritional options. As long as student are also aware that frozen vegetables can also be a healthy substitute then students will use what’s within their means.

As an aside, although gardens are difficult or sometimes impossible in urban environments, their benefits are numerous, and there are wonderful innovations, like Global Buckets that reduce their intractability. A couple of Montessori kids designed Global Buckets as a means of impoverished communities to get fresh vegetables. Now that the a new set of kids are inspired by gardens in the school and this healthier food program, what will they come up with?