Tuesday, December 18, 2007

Bubbles and insights

Because the kindergarteners had heard the word 'cell' for the first time last week (around the yeast-peroxide demonstration), I brought in more yeast along with a compound microscope so everybody could really see the single cells of the yeast organism. Everybody enjoyed seeing the little guys floating around at 400x magnification.



One voice piped up from the back,

"There must be hundreds of them!"

A simple comment, but beautiful for its depth of insight. He realized that the several dozen cells piped onto the TV screen via digicam represented one pencil-point-sized view on a much bigger slide, and the slide was made from one half-drop of solution taken from a beaker with a whole 250ml. Hundreds – probably millions of cells were in that beaker.

He realized that, not only were we looking at things on a scale of teeniness that was outside everything his senses had shown him so far, but also that the teeniness would require numbers that he didn't otherwise need in daily reality. You might pick a dozen flowers, or see a hundred pigeons, or pass a thousand cars on a long day's drive, but those cozy familiar numbers, the ones whose magnitude we easily intuit, just don't do the job when it comes to a question about the yeast beaker.

In SilverSurfers I pulled one of those "I have never tried this before and maybe it will work" stunts, and got lucky. Again I put the yeast cells under the compound microscope; then I added a half drop of peroxide over at the edge of the cover slip, just to see if maybe we could see the cell's-eye view of last week's fizzy demo.

Here is the video. It speaks for itself.

Monday, December 17, 2007

A point of disagreement

Last week in the waiting room at dance school I had a conversation with a non-Primavera parent.

She is a home-schooler. She claimed to have borrowed ideas on science teaching from the Waldorf curriculum. (Not having read extensively on Waldorf, I don't know how accurately she represents their methods). She said she was intentionally postponing science curriculum until around 9 years old. She continued with an example: if your child sees a shooting star, and asks about it, then your accurate answer might "deaden" the subject by closing it off. And science as a whole was omitted in order to allow the child a few years of thinking about the universe in magical or imaginary ways.

She and a third parent chatted on about how they might avoid "deadening," yet still play out the shooting star question with a "what do YOU think" sort of approach. While I thought this had, as they say in those disastrous job reviews where you can kiss your raise goodbye, room for improvement (see end note), my mind was busy racing off on two tracks: on the one hand, trying to find the gentlest non-confrontational way to steer her to do better, and on the other hand trying to gauge how deeply I disagreed with her.

Forty-eight hours have passed, allowing me to conclude that I disagree fundamentally and viscerally. Let me count the ways:

  1. An honest answer is not deadening
  2. There's plenty of wonder to go around
  3. You are starving your child
  4. Magical thinking is a gigantic failure
  5. There's plenty of imagining to do

1. An honest answer is not deadening

The real answer to what is in a shooting star is fascinating in all its details. It raises dozens of additional questions. It opens doors to understanding the universe in ways that never come up in daily life. A chunk of rock travels 100 million light years in total darkness! I never knew anything was so big! Or so many things lie hidden in the sky! It burns up? I never knew rock could burn! I never knew that air resistance, which I feel as gentle breeze, could grow so fierce!

2. There's plenty of wonder to go around

Go ahead and answer your child's question. Even if you satisfy her on the subject of shooting stars, I absolutely, positively, unconditionally guarantee she will be able to find more questions. She will not run out of wonder. Wonder does not have a Peak Oil moment. The supply of questions, and the supply of genuine mysteries to be asked about, will not diminish. As one of my professors cheerfully quipped, when an algorithm seemed to depend on finding and consuming ever huger numbers, "Don't worry. There are plenty more numbers."

Worse: if you dodge or refuse to answer about the shooting star, you are trying to create a sense of wonder by deliberately withholding information – like OPEC trying to increase oil prices by cutting off supply. Now you have created a type of wonder which is of limited supply, a sort of counterfeit wonder which runs out as soon as your control over the market weakens. A poor trade indeed, discarding the infinite for the artificially finite!

3. You are starving your child

Here at Primavera, the Question Box quietly invites the five- to seven-year-olds to ask questions. They respond with a never-ending river of questions. They want to know about plants, bugs, evolution, disease, death, stars, snakes, rocks, metals, fire, molecules, planets, electricity, machines, and rockets . . . and that's only in the first five minutes. They have a huge appetite for knowledge. Omit science from the curriculum, and you starve that appetite. A child grows complete and healthy on a balanced diet whose Food Groups include art, language, writing, social interaction, real world knowledge, story telling, and physical activity. Starve the mind of an entire food group, and expect to harm the growth of the whole.

4. Magical thinking is a gigantic failure

Some abilities come to us naturally. The ability to eat, and enjoy food; the ability to walk and run: we acquire these just by growing in a normal environment. The infant's drive for language acquisition seems to be hard-wired, as does the parents' complementary skill of language teaching.

Other abilities do not come naturally. For example, humans do not seem to have a built-in genetic tendency to read and write. Reading and writing are acquired because adults insist on their acquisition. We deliberately construct the rules, conditions, and actions that support reading and writing.

Scientific thinking is another ability which, uncultivated, can utterly fail to grow. Thousands of years' experience shows that people are quite able to get through life believing the earth is flat, stars are friendly spirits, diseases are caused by vapors, and so on; and they will fail to acquire – indeed, violently reject -- information that is acquired by other means, as witness Galileo's unpleasant experiences with the Inquisition.

Magical thinking, by contrast, seems to occur naturally. When you watch the football game, and clench your fists to give the quarterback extra strength for that critical throw, you are doing magical thinking! It's harmless in sporting events, and may serve nicely as a sort of social bonding technique ("we're all pulling together hoping Johnny passes his exam"). It has real uses, in storytelling, in facing and reconciling one's emotional states. But as a real world problem-solving technique, magical thinking fails over and over. It doesn't build better mousetraps, win or prevent wars, or cure disease (despite numerous attempts, the bubonic plague was never cured by murdering one's local population of Jews). And yet we see magical thinking all around us. My neighbor feels that global warming is probably just part of a natural cycle. Why does he think so? He just sort of feels it must be right. Worse yet, he votes based on his magical conclusions.

Children need to learn a method of thinking with inquiry, observation, and logic. Otherwise they risk growing into handicapped adults who support nutty political schemes, fall for Ponzi scams, buy products that fail to solve problems that didn't exist in the first place, and generally bring danger to themselves and others.

5. There's plenty of imagining to do

A passage from one of Maria Montessori's books explains the importance of imagining in the curriculum. She does not mean a day-dreamy sort of cotton candy and butterflies imagining. I have an uncle in America, she suggests. I have never seen either America or this uncle, but I use the facility of imagination to bring them both into my mind, and to build knowledge around these facts that I cannot observe directly. Imagination, combined with discernible rules about how the universe works, gives us the power to understand the world broadly and deeply: the Keys to the Universe.

Imagining, like wonder, does not have to be parcelled out, and does not have to be enhanced by deliberate ignorance. We do not need to imagine that maybe the shooting star is a sparkling fairy. We can imagine many real things about the shooting star, and we can extend our imagination with more questions – especially if we are confident our teachers will support us with all the knowledge we ask for.

- - - - - -

Endnote: "what do YOU think the shooting star is". This is an unfair response to the child. You are taunting her by refusing to divulge information. She does not know the answer, and she does not have a plausible way of guessing or inferring the answer. Your refusal to answer is like bringing dinner to table and then forcing the hungry child to wait, not allowed to eat until you finish your weird quiz game. Worse: by demanding an answer from her, you've suddenly put her under uncomfortable pressure -- even guaranteed her failure, because of course she has no way to provide the right answer.

We in Science Specialist class often respond to a question with "what do YOU think", but only in circumstances where the knowledge generally available, plus application of creative reasoning, might yield an answer: as in, "why do YOU think the dolphin needs to swim extremely fast?".

Wednesday, December 12, 2007

Experiments, quizzes and Pimsleur, and bubbles

The nematode experiment was a resounding failure. Remember we had these beneficial nematodes which are supposed to help gardeners by preying on grubs. So, I got two beakers, and dug up a couple grubs, and put one grub in each beaker (along with some vegetation and dirt), and then added nematodes to only one of the two beakers.

Both grubs died.

Learning opportunity: failed experiments are a constant in the scientific process. For every ingenious experiment that advances The Cause, there are hundreds that just fizzle out and fail to teach us anything at all. All this trying and failing is the creative process that leads you to devise a real winner of an experiment.
In response to this, we spent part of the class trying to think of better beneficial-nematode experiments. We didn't come up with anything so compelling that I want to rush ahead and try it, but the kids threw in some pretty good beginnings of ideas. We'll return to the subject next session.

Onward to the quizzes. Last year, when I wanted to learn some Arabic, I purchased the Pimsleur Method instructional CDs. One thing I noticed was that after they taught you a new word, they'd go off onto other content for about 90 seconds, and then ask you out of the blue to repeat the new word. You could just feel the darn thing trickling down the memory hole "dang it, they taught me how to say The Store Is Closed and I nearly forgot!" , and I'm sure the point of it was to catch that moment and cue your brain to transfer the word from short term to middle term to long term storage. (After the 90-second interval, they leave it for 180 seconds and then ask you again . . . etc)
With this in mind, we tried our first Science Test. Naturally this was nothing like those paper things with 100 multiple-choice and 50 short-answer questions, and all your prestige riding on the results. Think of Test as a synonym for Experiment. "Hey, let's do a brain experiment. I wonder how much is left in your brain from what we learned last week! Do you remember the part about the black holes or the sugar crystals or the intestinal cells? Was it trickling out the memory hole?"
Preliminary results:
1. We remember some very detailed information while at the same time totally losing other details. And I mean totally. Big, blank, empty space.
2. We remember some core concepts while at the same time totally losing other core concepts.
3. If student #1 remembers "A" but forgot "B", then student #2 might remember "B" but forget "A".
Interesting things, brains. You know that the ability to forget is essential to true intelligence, right? Collecting mountains of data is all very nice in its own way, but the real value is in organizing and structuring the data. Think of the last time you did a big garage organization project. Your most powerful ally? The trash can. The same is true of data in memory. Structuring requires weeding. And learning requires mistakes – such as overaggressive weeding of the data.

Of course we also had a fun demo. One of our Primavera parents led me to this one. (hint, hint: do you know a neat thing to do in a science class? Don't keep it secret) . This one is easy to do at home. Just throw some yeast into a bit of hydrogen peroxide. The yeast sets about destroying the (poisonous) peroxide, reducing it to oxygen and water. The sudden production of oxygen means . . . . BUBBLES ! . . . which means . .. WHOOPS OF JOY! For more spectacular bubbles, add a bit of soap before you add the yeast.