Commerce and discrimination

Those darned Republicans just can’t catch a break these days. In the latest cultural eruption, the Indiana legislature passed a bill which its governor signed into law. The bill allows places of business to refuse to serve persons if doing would conflict with their sincerely-held religious beliefs. An avalanche of public outcry has Indiana’s governor making a hasty retreat.

Charles Blow of the New York Times weighs in about how we should deal with the juxtaposition of free exercise of religious beliefs and discrimination:

“I would argue that when you enter the sphere of commerce in America — regardless of your ‘deeply held religious beliefs’ — you have entered a nondiscriminatory zone in which your personal beliefs are checked at the register, and each customer is treated equally.”

Indeed. You want to use the currency of an explicitly secular government to conduct your business? Then you can serve everyone who walks in your door. Maybe the best thing for these businesses to do is to refuse United States currency as payment, accepting only church scrip. That might clear things up.

Spotlight-searchable Pinboard bookmarks

I use the excellent, dependable Pinboard service for managing my bookmarks. A one-time fee gives you lifetime access to the service; and there is an API that has fostered an ecosystem of desktop and mobile apps that interact with the service. Of course, Safari can synchronize bookmarks among devices; but it doesn’t allow tagging. Since tagging is a major part of my workflow, Safari bookmarks don’t work for me.

So, here’s where comes in. It’s a relatively simple Python program that downloads your Pinboard bookmarks, writing them to local .webloc files and applying the tags you’ve used in the Pinboard metadata to the local files. Now you’re Pinboard bookmarks are searchable locally.


To use, you’ll first need to install the command line app tag here. Then you can download from my github repository.

Calling the script is just a matter of supplying at least the following arguments:

- `-u, --user`		Your Pinboard user name
- `-p, --password`	Your Pinboard password
- `-w, --webloc`	The path on your filesystem where the webloc files will be stored

Optionally, you can specify the path to the sqlite3 database that the script uses.

`-d, --database`	The path on your filesystem where the sqlite3 database is stored

Let me know what you think. @NSBum

Classroom teaching vs home teaching

Homeschool student practicing division

Homeschool parents are widely regarded as incompetent teachers.

Yesterday, I wrote about my assessment of a lopsided article on homeschooling. I made the mistake of reading the comments. One of themes that emerges from the negative comments is that ordinary parents aren’t up to the task of teaching children.

My husband and I are both teachers, but we’re well educated enough in pedagogy to know that we alone could not teach our children as well as a school environment could. And that teaching is a highly specialized professional field, but unfortunately one that everyone seems to think they can do. … I have two masters degrees, have extensively studied educational and developmental psychology, and have years of experience in the classroom. Of course parents know their own children, but that doesn’t mean they can teach. … Every parent assumes they know more than their child’s highly trained teacher. It would be so nice to be given the respect that professionals in other fields are granted."


Michelle asserts that teachers are professionals with extensive specialized training and experience, both of which homeschool parents lack. Of course this is true. But Michelle, however well-trained she may be commits a logical error by assuming that homeschool parents and classroom parents cannot both be competent in their own contexts. This is a false dichotomy. I’m a homeschool teacher (maybe “guide” is a better word; but whatever); and I have tremendous admiration for professional serious-minded teachers. Of course, I imagine Michelle would admit that teachers are not uniformly skilled and professional; just as homeschool parents are not uniformly qualified. Is the worst classroom teacher still better than the best homeschool parent? How would you know? Michelle creates a “straw-man” by portraying the decision to homeschool as based on their perception of classroom teachers as unskilled, unprofessional, and unknowledgeable. I doubt this is often the case. Our own decision to homeschool was difficult and complex. It had nothing to do with public school teachers.

Or consider the wisdom of Sandee from Houston, TX:

I do not like the idea of homeschooling at all. Oh, and ideas a parent might disagree with… which is, of course, the reason folks elect to homeschool their kids!


No, Sandee, we homeschool for many reasons. In our case, it has practically nothing to do with ideas we disagree with. We are secular to the core. We believe and teach that everything must be questioned and critically evaluated.

A doctor from New Jersey also opines that even the most educated persons in their disciplines are incapable of meeting the needs of their children:

I find there to be a certain arrogance in homeschooling your child. You know that saying about it taking a village to raise a child? As far as I am concerned, school is that village. My husband and I are both MDs. We had 12 years of public school followed by eight years of higher education. In college, I took multivariable calculus, differential calculus, college level physics, organic chemistry, physical chemistry, many, many biology classes, English literature and creative writing classes. My husband was a math major. We’re definitely not undereducated people, but I would never presume that I know enough to teach my children all the skills necessary to make it to college.

NMYNew Jersey

Well, Doc, maybe you’re right. Maybe you’re wrong. Without data, you simply don’t know. But, believe it or not, the purpose of education is not just stuffing more facts in kids’ heads. Maybe it’s a good way to get into med school (it was, I did it) but it’s a really poor way to regard education. The last sentence of the quote, though, points to a fundamental difference in our points of view. I don’t regard the goal of public education as “making it to college.” I want to be confident that my daughter has a love of learning and of books. I want her to be curious and skeptical. I want her to have time to pursue her interests. I want her to find a meaningful livelihood. College, medical school, graduate school, conservatory? All are fine; and our financial plans amply anticipate the likelihood that she’ll go on to post-seconday education. But the obsession with college is an unhealthy one.

There are dozens more comments like these. What they all have in common is a claim that professional public school teachers are always more effective at teaching children than parents. I want to look closely at this argument by defining the skills that make good classroom teachers and those that make good homeschool guides.

Command of the subject matter

Classroom teachers are expected to have a fluent command of their subject material so that it can be explained to a room full of children. But at the same time, we should be coaxing children to develop their own academic skills and self-discovery. Homeschool guides don’t have the same opportunity to go as deeply as classroom teachers within a particular subject; but they have a unique learning environment in which to foster curiosity in their children and to teach them the ability to find things out for themselves.

My question for the doctor quoted above and her husband is this: If your own primary education left you with so little confidence in your ability to teach it, why do you place such unwavering confidence in the institution of public school.

Learning climate

Although I’m not a classroom teacher, I’ve sat in enough classrooms to know how they work. Much of the work of the teacher in school is to set up a productive learning environment. There’s a bit of stage-acting. I’ve heard it described as “edutainment”. I’m not being pejorative here; there are real theatrical skills that excellent teachers possess or develop. It requires enough charisma to motivate and engage students while remaining true to the content and purpose of the lesson.

The homeschool guide is different. Most of us are comfortable in our own homes with our own children. Theatrical skills aren’t really needed. Instead, we weave learning into everything we do. We do set up a quite physical environment where we do our table-based work, our microscope, books, and other tools. But we aren’t bound by this space.


I once drove across the country with a friend who at that time was a recently-retired high school teacher. Before his tenure at the high school, he was a middle school teacher. Over the course of hours of stories, I came to appreciate the toll that the work of maintaining classroom discipline takes on teachers and on the learning environment. In his opinion and that of other teachers I’ve talked with, discpline is becoming a larger problem.

Disciplinary events in the classroom are a form of interruption. The flow of the lesson is broken; and it takes a moment for everyone to get back on task. Moments add up. The science of interruptions provides considerable insight about the cognitive burden imposed by these interruptions.

I do not mean to say that homeschool children never interrupt and never misbehave. But given that many misbehaviors happen in a social context of other misbehaving children, these sorts of patterns don’t emerge in homeschool. At the least, it is not overriding concern for the homeschool parent.


Both homeschool parents and classroom teachers need to have high degrees of empathy to be effective. Empathy, of course, is not the same as feeling sorry for someone. Nor is it feeling the same as someone else. Rather it is the ability to read the emotional state of another person and accurately communicate and respond to that state.

Good parents just do this naturally. Good teachers do to.

Formal pedagogy

There is a formal method in classroom teaching. In front of a class, the teacher appears relaxed, confident and engaging; but it belies the organization and preparation behind the scenes. Great teachers are not only good at conducting a classroom lesson; but they are efficient at preparing and follow-up.

In homeschool, we also have to be prepared; but the planning happens on a different time scale. Because I’m not expected to organize lessons for a classroom that would rapidly devolve into chaos if I don’t have a seamless game plan, I have only a rough idea about how our day is going to proceed. It allows me to be more responsive. I can slow down if ViolinGirl needs more time on something, or skip around if she’s bored because she already understands something. In short, I have to be organized enough to meet her needs; but I don’t have to plan every moment.

Not the same

Great classroom teachers are amazingly skilled. Michelle, quoted previously, incorrectly assumes that we homeschool because classroom teachers are unskilled or unknowledgeable. Among our homeschool peers, we do not know any who regard public school teachers in this way. We may have our disagreements with how schools are run in their bureaucratic way. But I don’t know any who disparage teachers.

Homeschool guides and classroom teachers simply have different roles. Anyone with more than a passing familiarity with how homeschools actually function will recognize that.

NYT on homeschooling

Homeschooler at work

The New York Times, in an embarrassingly unbalanced piece, portrays homeschoolers as unqualified, negligent religious zealots. Their lead vignette is blatantly snobbish:

“In a modest two-bedroom duplex in this town along the Allegheny River, 10-year-old Elijah sat on the floor in the living room on a recent afternoon. He paged through a workbook that Ms. Wiles had bought the day before at a Sam’s Club store, and went through a few questions about birds.”

For counterbalance: “Why Homeschoolers are Winning”.

Something completely different

Hiragana chart

After reading everything I can find about tsukemono (漬物), I’ve become fascinated by the Japanese language. Since I don’t have enough else to do, I’m going to finally take the plunge and commit to learning it.

It’s a fascinating language because the written form is a hodge-podge of three different orthographic systems. It seems that most people start with the hirangana (ひらがな) which is a syllabary with each symbol representing a complete syllable. This is the writing system used for most native Japanese words. The next system to learn are the katakana (カタカナ) which is also a syllabary system. Whereas the hiragana are used for native words that have no kanji equivalent, the katakana are used to spell non-native, loaned words, scientific words and so forth.

Finally there are the kanji (漢字) which are Chinese characters that have been adopted into the Japanese language. Several thousand of these are in common use. There are about one thousand such characters that kids learn in elementary school. These are called the kyōiku kanji (教育漢字) which means “education kanji”. I’ve started playing around with a web-based resource called TextFugu that uses a different system for teaching the kanji, relying on logical groupings, mnemonics and so forth.

I’ve discovered serveral resources early in my learning:

  • TextFugu is a web-based textbook of Japanese. It is wordy; but enjoyable. The first chapter, an introduction and beginning the hiragana (ひらがな) is free. After that, the site works on a subscription basis with monthly and lifetime options.

  • Hiragana chart is the grid of all of the hiragana.

  • Hiragana stroke chart. This is a printable chart showing the order of the strokes that comprise the hiragana.

  • Katakana chart is a printable pdf of the katakana laid out in the grid that TextFugu uses.

  • Learn Japanese is another internet-based textbook of Japanese. Like TextFugu, it has many videos and audio embedded in the text.

  • Anki is a flashcard program that works on the basis of spaced repetition[1]. I’ve used it for many years to memorize other material. But since the word for memorization in Japanese is “anki” (暗記 or あんき) I decided it would be perfect for this task.

  1. Spaced repetition is an interesting technique for memorizing material. Cognitive scientists first noted that manipulating the timing of repetitions improved recall back in the 1930’s. In the 1970’s Leitner devised a method of using flashcards distributed into sequential piles to implement spaced repetition. But practical use of spaced repetition did not become more widespread until the advent and general availability of the personal computer.

Making nukazuke

Toasting rice bran for nukadoko

Since first trying tsukemono (漬物) nearly 20 years ago, I’ve been infatuated with Japanese pickles. In the U.S., we’re accustomed to a very limited range of pickles - usually cucumbers pickled in a vinegar solution with or without dill. Not so in Japanese cuisine where the variety of pickling techniques is amazing.

One of the most intriguing varieties of tsukemono are the nukazuke (糠漬け) which are vegetables that are preserved by burying them in a bed of fermented rice bran (糠). The resultant pickles are crisp, salty and tangy; but the process of preparing the nukadoko or nukamiso (ぬかみそ | 糠味噌) is not easy. I started my own nuka bed 4 weeks ago and it is just now starting to develop the complex character of a mature nukamiso.

The base of the bed is made of rice bran that is toasted over a medium flame in small batches with constant stirring to prevent scorching. You must stir it quickly and very vigorously as the color deepens. The goal is to toast it until it becomes a few shades darker. I used Bob’s Red Mill stabilized rice bran. I’m not sure what effect “stabilization” has on the product; but everything seems to be working. After completing the toasting of the entire bag in small batches, I carefully weighed the toasted bran. You need to get the exact weight because the amount of salt must be adjusted according to a strict proportion.

I added Korean sea salt, the sort that I use for kimchi. If the ambient temperature is cooler, you can get by with about 13% salt or less. Warmer climates need about 15% salt by weight. I split the difference and adjusted the salt to 14%. The salt must use no additives such as iodine. Sea salt is best.

Next, I dried the peel of two apples and one very ripe persimmon. I used a food dehydrator to accelerate the process. I added the dried peels and several pieces of dried kombu (昆布) to the toasted nuka and added just enough distilled water to make a slightly pasty mash. The amount of water is hard to specify; but it needs to be like wet sand. Under no circumstances should it pool in the bottom of the container. Finally, you must add starter vegetables to the mix. They stay in for a day, then are removed and discarded. The idea is to see the bed with the bacterial flora that it needs. Ideally, these are species of the genus Lactobacillus but I’m told that under certain circumstances - too little salt, too much water, too much warmth, too little airflow - that yeast can become prominent. This upsets the balance of microbial flora and can set up alcoholic fermentation. Of course, this is undesirable. By restoring some of the ideal factors, you can apparently reset the microbial balance; but who really knows?

Speaking of containers, I used shallow glass square container; but it is not ideal. Traditionally, wooden fermentation vessels would be used. Almost anything works. Most importantly, there has to be some airflow. I cover it only with a dish towel. It must be mixed with clean hands every day forever. I’m told you came get by with putting it in the refrigerator for a week or so if you’re away.

It took a little over two weeks to discern that anything was going on. The bed begins to take on a nutty, sweet aromatic smell about then; and the color begins to darken still more. Between three and four weeks, I added a little more toasted nuka to supply fresh unfermented material to the mix, to increase its volume somewhat and to dilute the salt somewhat based on my early tasting. After the bed matures about 4-6 weeks, it is ready to start pickling. Most vegetables can sit covered in the nuka for anywhere from a few hours to a day or so.

Do not question the algorithm

Uber, the creepy[1] ride service company, wants us to just accept “The Algorithm.”

During a recent hostage situation in Sydney, Uber increased its rates according to a “surge pricing” algorithm. When the inevitable backlash occurred, the company attempted to excuse itself by claiming that the price changes are algorithmic and that the company wasn’t engaging in a deliberate attempt to take advantage of a crisis. The former, of course, is a ridiculous claim because (to paraphrase Dr. Paul Batalden): “Every algorithm is perfectly designed to get the results it gets.”[2] If the algorithm fails to account for crisis situations, its designers either failed to consider that crises might occur, or they did consider it but are hiding behind “The Algorithm.”

The real problem here is both insidious and pervasive in our internet-solutionist culture. Internet companies like Uber, Google, and Facebook expect us to accept that their unseen algorithms are inherently fair and just. Their pleas that we should learn to love their algorithms are attempts to endow them with properties they simply do not have. Algorithms are not naturally-occurring phenomena whose properties and behaviors are waiting to be discovered and accepted. They are designed by companies in an effort to advance their own interests.

Reminds me of Evegeny Morozov’s thesis in “To Save Everything Click Here”.

  1. Why “creepy”? As The Telegraph points out, it’s not the NSA spying you need to worry about. It’s companies like Uber whose executives threaten journalists who dare to write a critical article.

  2. The original quote was: “Every system is perfectly designed to get the results it gets.”

Not taking sides

Plus ça change plus c'est la même chose

The headline on the New York Times reads: “Obama avoids taking sides on effectiveness of CIA techniques.”[1]

Seriously, you can’t take sides on torture? If you can’t say something definitive about the abhorrent use of torture by the CIA and their operatives, then you shouldn’t be in charge of a nation that sees itself as just and compassionate.

This is not difficult. We have no right to complain about human rights violations in other countries when we are an unrepentent violator.

  1. Baker, P. (2014, December 10). Obama Avoids Taking Sides on Effectiveness of C.I.A. Techniques. The New York Times. Retrieved December 10, 2014, from [Link](Baker, P. (2014, December 10). Obama Avoids Taking Sides on Effectiveness of C.I.A. Techniques. The New York Times. Retrieved December 10, 2014, from

On becoming a superstar

I recently stumbled on an intriguing book entitled: “How to be a high school superstar: A revolutionary plan to get into college by standing out (without burning out)” by Cal Newport. As a homeschool parent, I find that I think about how to equip my daughter to “sell herself” more effectively to admissions committees earlier than I would if I didn’t. After all, we have no one else to rely on; our family is almost entirely of our own making.

The thesis is simple. Most high school students attempt to stand out by competing on quantity and in the process they either burn themselves out or they lose sight of the very attributes that would make them more appealing to admission committees. Or sometimes they get lucky and win at the numbers game.

The most successful kids are those who are, in a word, interesting. Any reasonably endowed kid can load up his schedule with AP classes, sign up for a bunch of clubs, reluctantly volunteer at Habitat for Humanity, and half-heartedly play the clarinet in the band. But if you’re playing the numbers game with this, you’re already at a disadvantage because that what everyone else is doing. And what do you say when the interviewers asks you about any of these activities? If you’re only half-engaged, then the child ends up giving a rehearsed boring answer to the question.

This book takes a contrarian approach - which to a contrarian like me always sounds appealing. Instead of trying to win on quantity, Newport urges kids to compete on “interestingness”. When I was a more active Flickr user, there was an “Interestingness” score that the service assigned to photographs. Maybe it’s still the same. No one ever knew exactly what made one photograph more interesting than any other; but there was a certain “je ne sais quoi” about images that achieved that status. Maybe kids are like Flickr images and admission committees are looking for capable kids with a quality of interestingness.

Newport encourages kids to follow three laws of being what he describes as a “relaxed superstar”:

  • The law of underscheduling. Give yourself plenty of time to explore things that are interesting to you. (Remember when people had hobbies?)

  • The law of focus. Be the master of one area of interest. Don’t cover the waterfront with activities that fail to tell a coherent story about who you are. I always think about good ideas as being those that you can describe in a 15 second elevator pitch. Maybe the best kids are that way. Unrelated activities don’t add up to anything coherent. I wrote about this not long ago[1].

  • The law of innovation. Newport describes this law as the pursuit of “accomplishments that are hard to explain [but] not hard to do.” For me, this was the hardest bit to understand and agree with because there are so many worthwhile pursuits that kids can follow that aren’t necessarily innovative. Perhaps one way that students can be innovative without necessarily abandoning their passion is to find an innovative “angle” on their pursuit. If you are a musician, for example, how can you find something unique to do with music that complements your interest?

This is an area where homeschool parents may have an advantage. It’s easier to have unscheduled time when the entire schedule is up for discussion.

  1. Duncan, A. “Hoping something sticks”, October 9, 2014. Link