Archive for the ‘Teaching Science’ Category

Why Reading Levels Continue to Decline–PART I (of 2)

April 30, 2015

Students who still can't read

The problem of students who are unable to adequately read their grade-level textbooks is not new; the problem starts in early elementary school and only gets worse as students move up in grade levels.  Unfortunately, the rise of the internet in the past twenty years has only exacerbated the problem.

Let’s look briefly at the pre-internet reading situation in middle-class schools and above (poor schools have additional problems which will not be treated in this particular article).  Looking back, the most important function of the school library was to be filled with books to be used for school research projects which were at the correct reading levels for students.

Primary School Libraries

Not only were grade-level books provided, but there were plenty of below-grade-level books on every topic available to readers who were still below grade-level.  For example, a middle-school student with a lower reading level could still find good primary-level books on any research topic assigned. There used to be hundreds of books available through publishers, on every conceivable topic, for school libraries and public libraries to choose from.  Bookstores made them available to the general public.

Today, funding priorities are focused less on providing new books for the school library–partly because of the explosion of new topics and knowledge in our modern world, and also because of the explosion of information on the internet.  Now funding must be divided between  books, and new library computers.

The market for children’s non-fiction has plummeted since 2005.  Sales to both libraries and bookstores have dropped substantially. Therefore,  fewer nonfiction books for children are being written and published.  Publishers and booksellers decided to drop most nonfiction, and focus primarily on children’s fiction–for which there does continue to be a market.

Desirable Non-Fiction Book Topics

 The lack of nonfiction is particularly damaging for boys.  They tend to prefer autobiographies, nonfiction, newspapers, and realistic topics. Ever since 2005, as the internet has become more powerful, children’s nonfiction has declined.  This decline is preventing many boys from developing as readers. National standards in Britain and America drive the decline even further, “…as the strictures of the national curriculum have driven many publishers to stop producing anything very original, and how many books on Vikings and rainforests do we really need?”

Starting in middle school–most commonly Grade 6 and above–teachers now direct students to the internet for research, instead of to school libraries. One reason is that science classes are now often researching topics which are not even available in books in the school libraries–things such as genetics, and various types of cells–and this is happening in Grades 6, 7, and 8.

Students are now being asked to research obscure people for reasons of diversity in the classroom, rather than famous people.  This means that the information can only be found on the internet.  Students are now expected to use the internet for all research.  This is now true even in elementary school.  Students may be assigned reports on animals, for example.  Perhaps there are perfectly good books in the school library at the right reading level; however, it has now become “too much trouble” to even check , when one can “just look it up online.”

Using online sources creates a much worse problem–aside from the problem of whether a source is reliable, biased, or incomplete–that is, the problem of reading level!

Below is reading sample from a Grade 5 science text which more than half of students (even in good schools) might find too difficult to read without the teacher’s help.  Why?  Because students are now used to reading only fiction in reading class.  They are not used to the vocabulary in non-fiction; nor are they used to reading expository sentences..

Levers text


Not only have student reading levels declined in real terms, but the sources students are now attempting to use are usually written at far too high of a level for their age.  Students in middle school and high school usually go first to Wikipedia (and are often specifically told to do so by their teachers, particularly in international schools that have much less access to English-language printed material).  Unlike school library books or school text books of old, vocabulary is not controlled for difficulty.  Sometimes the articles are poorly written, and written by scholars who are just trying to impress other scholars with their difficult vocabulary.

Below is a section of what one of my 7th-graders attempted to read for a report on glial cells last year, using Wikipedia.  Most students now need adult help to translate and explain what they are trying to read.  To a poor reader, this may as well be in Chinese:

Glial cells text from Wikipedia

Those students who can afford it hire private tutors.  My students show up and say, “I have a project or report due next week on glial cells (or guard cells, or an obscure historical figure).  Can you help me?”  Students arrive knowing nothing about the topic, and are expected to research on line, and write a report listing their sources.  So, together we look on line and usually find very scholarly articles, which I, as an excellent reader in my 60s with a graduate degree and decades of experience teaching, sometimes have trouble understanding!  So we pull out little snippets of information from various articles, which I explain in plain English and then mark our source.  Even many Wikipedia articles are written by scholars, seemingly just in order to impress other scholars!

Hiring a private tutor

I learned a great trick years ago when I was in a professional writers’ group.  If you need good, concise information on an area or a subject, one of the best ways to find it is to go directly to children’s books, where you can find the information thoroughly distilled and written in clear, easy English.  I use this same strategy now and show students how they can search on the internet using the search terms “my topic + explained for children.”  It doesn’t always work, but it often does.  Sometimes we arrive at a website where something has been clearly explained at a reading level appropriate for middle-school students.

The thing which most excited me about the internet when it first began, especially as an overseas teacher with little access to English-language reading materials, was its potential as a world library at our fingertips.  Sadly, much of this potential is being lost for two reasons.  First, children are not developing adequate non-fiction reading abilities to function in society.  Second, most of what is available on the internet is written at far too high of a level for students to be able to benefit from it.

In most American schools, for the past several decades, the textbook has been seen by teachers as only one resource of many for classroom use.  In fact, years ago, over-reliance on the textbook was almost seen as the mark of a lazy teacher, within the teaching profession.  Unfortunately, the current result of this attitude has now led to teacher over-reliance on the internet, with students who are unable to understand either their textbooks OR the internet!  I personally have come around 180° to the view that students would be better served if they learned and discussed in class everything which is in the textbook.  Now, however, there is a new problem!  Many schools are now moving entirely away from textbooks as a way to save money, and teachers are mostly downloading random worksheets from the internet. Unfortunately, it is students who are again losing out on their education.

Part II of this series will discuss what parents, schools, and teachers can do to address these problems.

–Lynne Diligent

Why the Flipped Classroom Has Gone Too Far

April 20, 2015


Flipped Classroom

The flipped classroom is just not appropriate for all subjects, all of the time.  This educational fad has gone way too far, and is being used for the wrong reasons.  Most importantly, it runs into problems when teachers attempt to use it as a time-saving device in order to cover more material, because only a small percentage of students’ reading levels are actually up to grade level.

While the flipped classroom sounds like a new idea, it is actually an old idea.  Several decades ago, it was called preparation–a good name–in Britain, although I am not aware of any specific name for it in America.  It often consisted of reading a selection in a text book before arriving in class, for example, so that one could better benefit from a lecture.

The flipped model works extremely well for math classes.  As an elementary teacher, I would look each day at the following day’s homework section.  I would give about fifteen minutes of instruction and guided practice specifically on what my third graders needed to complete that day’s homework. We did not waste time in class doing homework.


I expected all children arrive in class with their homework complete, in order to be ready for the most important part of the lesson, learning from mistakes.  Right or wrong, they all got nice, big A‘s on the homework for completing it in pencil (including showing all work and carry numbers or cross-outs).  If they did not show their work, or if the work was either undone, or incomplete, they got a large, red F.  Within a short time EVERY child arrived daily with homework done.  We then put pencils away, and got out ink pens which we called “marking pens.”  Each child corrected their own paper.  There was no incentive to erase wrong answers, because the child already had an A, just for completing the homework.  We spent the following 30 minutes going over the problems missed by the largest numbers of students, working them on the board.  Students learned so much when they could see where they went wrong.  In most cases, we found errors such as subtracting the ones place, while adding the ten’s place, in the same problem–or, in forgetting to add in carry numbers, things like that.  In math class, the flipped classroom works fantastically.

Using the flipped classroom as a time-saving device runs into trouble in subjects which require a lot of reading for two reasons.  One reason is that in many good schools, students are feeling overwhelmed with the amount of homework, leading them to take ineffective shortcuts.  Using Spark Notes, and similar services, just do not engage student interest, and students miss the benefit of the literature.

The most important reason the flipped classroom runs into trouble is that students’ reading levels are just not up to grade-level standard in terms of being able to read either text books, or literature, on their own.

This problem is not new.  It was widespread in the 1970s and 1980s.  Secondary teachers in Colorado at that time were required to take Reading in the Content Area.  It was a course designed to help secondary teachers help students who were unable to read their textbooks adequately.  Because of the decline in book reading and adequate reading instruction, together with the rise in technology, in 2013,  more than two-thirds of students in the United States were now below reading level for their grade.

4th Graders Who Scored Below Profient Reading 2013

Unfortunately, today, most students, even some of the best students are not even attempting to read literature (or their history, or science, text books).  Most are attempting to find the film online.  Poor readers who attempt to read Spark Notes have trouble understanding even that, and certainly no one finds Spark Notes inspiring.

Many secondary English teachers (including elementary reading teachers, and secondary science and history teachers) are now assigning reading for homework, in order to cover more material and just have discussion in class.  The problem with this is that two-thirds of students are either not able to read effectively, and do not even attempt to read because of feeling overwhelmed.

So what do teachers need to do in order to combat these problems effectively?

First, they need to read the book (or text book section) themselves, in the mindset of a student, thinking about vocabulary which many students may not know, and noting it down.  They need to think about the major ideas and how those ideas relate to life today.

Next, they need to introduce the book or reading selection with a short, inspirational talk, that will make students feel like they can’t wait to read more!  They need to talk about and explain vocabulary (whether it is old-fashioned language or science terms) before students start to read.  History teachers need to think about the problems they are teaching about in a historical context and how those problems relate to life in the world somewhere today. Introduce the similar problems and questions of today and how they are being dealt with in the modern world, then look at the same questions in how they are being dealt with in the novel, or in history, or in the science text book.  Discuss what could happen in the future with the same issues.

Rather than starting a unit with reading the text book or novel, start the unit with a discussion of the students’ life questions about the issues which will arise in the reading selection  Here are three examples:


History:  While studying various political decisions of Roman Emperors, first discuss similar problems in the modern world.  Open with a question, “What do you think about when you hear of an apartment building collapse that kills people because of shoddy building practices?  What should be done?”  Or, “What’s it like to be stuck in rush-hour traffic?  What would it be like if the highway were also clogged with pedestrians, donkey carts, and horse-drawn carriages all at the same time, and it happened four times a day instead of two times a day?”  Then, “Now let’s see how they dealt with these same problems in ancient Rome.”

Rhett loves Scarlet, while Scarlet loves Ashley and uses Rhett!

Rhett loves Scarlet, while Scarlet loves Ashley and uses Rhett, in Gone with the Wind

Literature:  “How many of you have ever had the experience of being in love with someone, only to have that person be in love with a different, third person?”  Then, “The problem of love triangles is universal throughout human history, and that’s what this novel is about.”

Science (Astronomy):  “Does alien life exist on other planets, or in other galaxies?  What do various current scientists think about this, and why?  Which planets and stars are most likely for this?  What kinds of planetary conditions are thought to be necessary?  Could we actually travel to other stars or planets, and how long might it take?”  Then, “Now let’s turn to the text book and begin reading together about the planets.”

Lastly, MUCH more time needs to be devoted to in-class reading (even in high school).  If teachers are concerned about embarrassing some students reading aloud, or if there are poor oral readers, students benefit greatly (even in high school) from the teacher reading aloud well (and adding in inflections and pauses), while they follow along.  It also gives everyone a chance to stop and discuss various points, such as how they feel about actions characters take, or what situations they find themselves in.

Teachers need to inspire and motivate students, and help students to see connections that they would not see on their own.  If the teacher is excited about the material, he cannot help but communicate that love and excitement to the students.

–Lynne Diligent



The New Math: Part II – Three Reasons Why It’s NOT Working in So Many Schools

September 5, 2013

My students come to me for math tutoring because they continue to flounder with the “new math” curriculum.  For a complete description of what is being taught and how it feels for students, see Part I of this series.  Part I – The New Math:  Why We Have It

If expert mathematicians have redesigned the curriculum, why aren’t the results better?

Expert mathemeticiansEinstein

I believe it’s because the experts aren’t taking into account the developmental stages of most students, and because they really aren’t aware of the problems most classroom teachers are faced with.

The new math teaching methods are mainly designed to create:

1.)  the ability to work in cross-disciplinary teams;

2.)  understanding (now viewed as even more important than being able to compute); and

3.)  innovative and divergent math thinkers–the three characteristics increasingly required of white-collar jobs in industry today.

Yet the new math curriculum is failing to achieve these goals.  Let’s take a look at WHY, by seeing how these things actually play out in most classrooms.

How These Three Goals Actually Work Out in Classrooms:

1. Creating an ability to work in cross-disciplinary teams. The idea is clearly that “putting students in groups to solve problems” will create this ability. However, there are TWO IMPORTANT REASONS why this is not happening in most classrooms. The first reason is BULLYING, and the second reason is STUDENT ATTITUDE and LACK OF MATURITY.

cross-disciplinary teams

Middle-school, when most students are first put into math-solution groups, is the age of the MOST EXTREME BULLYING (although bullying starts in Kindergarten). Students are usually left to sort themselves into groups, and usually, in-crowd friends choose each other, while the remaining students are randomly forced into groups with students who regularly bully them. This same situation continues in many high-school classes, and is sometimes worst of all in the smallest schools where there is only one math class per grade.

It takes an extremely effective teacher who can give groups precise tasks, direction, and rewards based on individual effort to get a group to make effective progress. Generally what happens is one of several things. The students don’t understand what they are doing at all and therefore have no idea (or motivation) even to try. They end up wasting time and talking about non-math-related matters. Or, at best, one or two students do understand and do the work, while the others loaf and do nothing, but coast on the group grade (if there is one), having not done the work, and not understanding the work that was done by the others. Or, those who are friends in the group use the hour as a social time, while the unwanted group members spend the time staring at their papers, feeling excluded, and just wasting the whole hour.

Requirements for effective group work are:  1.) being in a group with others you like or respect, and others who like or respect you; 2.) Having enough background in the subject, that when given A SPECIFIC TASK, all the individuals in the group can work on it;  3.) Being able to effectively subdivide tasks; and 4.) Having individual accountability for one’s contributions to the group. Most teachers do not have either sufficient time or experience to be effective in all these ways and rely on immature students who are not willing/able to these things themselves (as an adult work group would be able to do).

2.  Creating understanding of WHY methods work, rather than merely learning computational solutions.  This is an admirable goal, but it is not being correctly implemented at the proper ages, in the proper stages, or in the proper ways.

understanding the new math

Mental maturity, and ability to deal with abstract concepts arrives at different times for different students.  Abstract thinking arrives for a very few students in the lower elementary grades, for a few more students in the upper elementary grades, for about half of students by middle school, and for at best two-thirds of students by high school and early adulthood.  For some people, it never arrives at all.  Having taught a great variety of math topics over the years, some students grasp one topic at a young age, but don’t grasp another until many years later, if at all.  Since every student has a unique profile of what they grasp or don’t grasp, this is the origin of the “spiral curriculum,” where each year, many topics are introduced, and each year, the math texts cut slightly deeper into each topic (assuming the school is still using math texts).

Let us take telling time as an example.  A few students are able to grasp telling time well in kindergarten, while others, no matter HOW much time is spent in the classroom in grades two and three, just cannot grasp it until fifth grade.  Then suddenly, something “clicks.”  Their brain has arrived at the right level of mental maturity.

Unfortunately, today’s curriculum introduces so many topics that few are actually mastered.  Thus, many students move up through the grades NEITHER understanding, NOR being proficient in calculating.  Most students need and WANT to become proficient at calculating and getting the right answer in the elementary grades.  This builds their confidence.  They also want to know in what situations they might use those skills (which gives learners motivation, and is often an area neglected by teachers).  Those who do not become proficient at calculating lose confidence in themselves and are certainly even LESS likely to be open to any discussions of “understanding.”

A current controversial topic in the math field is whether students need a certain amount of proficiency before they can understand “why” things work.  After two decades of experience teaching math at the elementary and middle-school levels, I come down hard on the side that it IS necessary.  Young elementary students can appreciate that a correct answer can be found through several different methods, but it is a waste of precious class time AT THAT AGE to spend a lot of time on WHY (an abstract concept which despite the weeks spent on it does not actually increase their understanding) instead of on developing proficiency and thereby building students’ confidence and excitement about learning more.

It was not the intent of the math experts, I am sure, in revising math curriculum, to have students wind up being neither able to understand, NOR be able to calculate!  Their intent was to WIDEN the curriculum to INCLUDE more understanding.  But with only four-to-five hours a week (at best) of classroom time to teach math per week,  at least half of the available time is being taken up with “understanding” (which is not being understood by the majority of students), and not enough time for most students to become proficient at calculating.  Those who do become proficient are generally having additional support from parents and tutors.  Furthermore, homework has been greatly reduced from a decade ago (approximately cut in half) which means that more students than ever before are not mastering basic procedures.  When students get into middle school and one-third of them still cannot determine the answer to 3 x 8 without consulting their calculators, it is highly unlikely they will gain any “higher understanding.”

3.  Creating innovative and divergent math thinkers.  Criticisms of the past were that students were memorizing times tables and learning to calculate, but not understanding what those calculations meant; students were unable to take even a simple story problem and know which calculations to perform.

innovative and divergent thinkers

After two decades in the classroom, I can easily see this problem did not stem from memorizing or calculating.  This problem stemmed from teachers throughout school not teaching children how to TRANSLATE between English words, and math language.  In most cases, elementary teachers are not math majors.  In fact, most became elementary teachers because they are math-phobic!  They teach the calculations, and generally skip all the story problems (as did I when I first began to teach math).  Yes, it is partly a time problem, but the REAL problem is that most teachers are afraid they will not be able to explain to students how to do story problems, because they never learned themselves! Speaking as someone who did not learn this skill myself until I was an adult, I see that this is the number one area that students need the MOST help with.  I find myself wondering if students in India, China, and Japan are getting this sort of help from a young age, while students in the West are not?

Rather than wasting precious elementary time on esoteric math subjects, and making “arrays” for WEEKS in order to “understand” multiplication, students would be much better served learning to calculate, and having DAILY GUIDED PRACTICE on particular types of story problems, both in order to recognize types of problems, and to be able to readily understand how to translate the English language into MATH language.

What the math “experts” who design curriculum are not realizing is that showing students all the different possible ways to solve every type of math problem does NOT create the “divergent” innovative thinkers they are looking for.
As for math majors, sometimes (not always), those who were brilliant in math are unable to explain it clearly to those who are having trouble, because the teachers never experienced those same troubles themselves.  Sometimes (not always) teachers who were not good math students are able to master math, and are far better at figuring out where and why students are “stuck.”  Lucky children with difficulties have those teachers!  The very first requirement for becoming a divergent thinker is self-confidence in one’s own abilities.  This comes from being sure that one knows at least ONE way to get the right answer every time, even if one knows that other ways do exist.  The main thing is to MASTER at least one method.

Beyond competence, creating divergent thinkers is more of a personality-trait question.  This question has more to do with motivation and stimulating interest, and comes from the sort of child who always asks, “Why?”  Most children don’t ask why, and most don’t care about why.  To create more innovative, divergent thinkers, every teacher in every classroom, in every subject, needs to challenge ideas and get students excited about learning.  And yes, teachers need to be “entertaining,” too! Innovative thinkers aren’t usually innovative in just one area (such as math).  Most innovative thinkers draw their ideas from multiple sources and synthesis of ideas from multiple disciplines.  Students need help becoming competent, and beyond that, to be inspired enough to pursue their own interests in a self-directed way.  Curriculum which forces students to calculate by many different methods fatigues many students and actually de-motivates them from further self-directed learning.

It is difficult for a new or average teacher to overcome these difficulties.  Hopefully with time and experience, Western society will adjust to the new math curriculum, but I am afraid it will be later, rather than sooner.

–Lynne Diligent

The NEW Math:  Part I – WHY We Have It

The NEW Math: Part I – WHY We Have It

September 5, 2013

Test Anxiety

“PLEASE, can you help me, Mrs. D.?  We are having a math test TOMORROW and I don’t understand anything!”  This has been the most common complaint I have from my sixth- and seventh-grade tutoring students (ages 11-13).  Whether the topic involves geometry, equations, story problems, or even more basic calculations, nearly all my students (excellent students, too) are having the same dilemma.

If you are a parent or educator who has wondering for years (as I have) WHY we HAVE the new math, this post will explain it clearly.  (Part II explains why the new math is not working in many schools.)

 The New Math Style

The new math style in some schools appears to be, “The teacher doesn’t explain—he or she merely facilitates ‘groups’ while students (hopefully) just teach themselves.”  Like many people, I have felt confused for several years about the new style of math teaching.  Instead of presenting a lesson, giving students guided practice, and then sending them home to do independent practice (homework), the new style, which my tutoring students are experiencing, seems to be, “Don’t follow a text book (even if they are available).  Instead, just find some seemingly random problems off the internet (seemingly without any overall coherent plan of units), tell students to put themselves into groups, and pass out the photocopies.  Tell the students, ‘See if you can find some solutions to these problems.  Do this for three or four days, then tell students, “We will be having a test on Friday.’ “

Imagine middle-school students with these feelings being asked to get into a group and work on random problems.  It is not likely to go well.

Imagine middle-school students with these feelings being asked to get into groups and work on random problems. It is not likely to go well.

Of course parents’ reaction to this is panic.  Eighty percent of the children are LOST with this approach. Those who can afford it are rushing to math tutors, who teach the children by traditional methods what they should have learned in school.  Those who cannot afford it have children who fail.

Let us look at a “hammer” analogy.  Instead of saying, “Let’s learn how to use a hammer and see if we can get a good result with the nail pounded in correctly,” the new approach effectively asks, “Let’s learn why the hammer was developed, and how and why it works in theory….but don’t waste your time becoming competent in using one!”

hammer nailing into a board

Next, students are given a national or state test consisting of pounding nails into a board, which of course they FAIL!   Meanwhile, the “experts” lament that they are unable to do it!  

This is exactly what has happened with math education.  Teachers using “traditional” methods have been drummed out of education (mostly retired), while younger teachers have all been trained to use the “new” methods.  

WHERE did this approach ever come from?

I finally found the answer I’d been searching for, in a MOOC (FREE online course offered through Coursera, taught by world-renowned British mathematician Keith Devlin of Stanford University, Fall 2013, called Introduction to Mathematical Thinking.)

Keith Devlin

Keith Devlin

Devlin explains that in the job market, there is a need for two types of mathematical skills.  He describes Type 1 skills as being able to solve math problems that are already formulated, and it’s just a matter of calculating the correct answers.

carpenter measuringmachinist measuringloan officers

Type 2 skills involve being able to “take a new problem, say in manufacturing, identify and describe key features  problem mathematically, and use that mathematical description to analyze the problem in a precise fashion.”

aircraft designBoeing CEO

“In the past,” Devlin says, “there was a huge demand for employees with Type 1 skills, and a small need for Type 2 talent.”  In the past, education produced many Type 1 employees and a few Type 2 employees.  However, in today’s world, the need for Type 2 thinkers has greatly expanded.  Not only do scientists, engineers, and computer scientists need to think this way, but  new business managers also need to, in order to be able to understand and communicate with math experts and make decisions based upon properly understanding those experts.  So the “new math” curriculum is an attempt by the “experts” to produce many more Type 2 thinkers; yet, it is FAILING to do so.

Prior to the late 1800s, math was viewed as “a collection of procedures for solving problems.”  In the late 1800s a revolution occurred among mathematicians which shifted the emphasis from calculation to understanding.  The new math of the 1960s was the first attempt to put this shift into the classroom, and the results were not successful.  I see the current shifts to put new math into the classroom as the second attempt, which is different from the 1960s attempt (children are not studying various bases these days), yet no more successful in reality.  Part II of this series will explain the three reasons WHY this is happening.

 –Lynne Diligent

The New Math:  Part II – Why It’s NOT Working in So Many Schools

Students Mourn Never Learning Cursive

April 3, 2013
Cursive - the new undecipherable secret code script!

Cursive – the new undecipherable secret code script!

Cursive was taught in my school until four years ago.  When I left, the school discontinued it as a regular subject.  Now those students are in upper elementary and early middle school, and can neither read nor write in cursive writing.

Among my tutoring students, several of them have expressed to me their sadness that their older brothers and sisters can read and write in cursive, and they cannot.  Still being in the first few classes not to learn cursive, they feel babyish and incompetent.  Perhaps in subsequent years, this embarrassment will disappear when none of the new students  have older brothers and sisters who know cursive, when they don’t.  In another six or seven years, no one will know it, and it will seem normal to upcoming students.  It’s only those in these transition years who will feel the loss.  But they will feel it for the rest of their lives.

How many adults remember the childhood feeling of waiting to learn “grown-up” writing, or scribbling to other young friends (at the age of five or six) on a paper and bragging, “I know how to write in cursive?”  Of course, at that age, no one knew, so your friends believed you, because they couldn’t read it, either!

When I tutor these students, I have to slow down and print (much more time-consuming).  Of course these students also will never be able to read historical documents or even old family letters. Furthermore, most European and Latin American countries don’t teach printing at all–they teach only cursive script starting at the age of five.  I feel this bodes poorly for a future globalized world.

I’d be happy to teach cursive to these students (being an expert cursive teacher), but that is not what I’m being paid to tutor in–we generally spend the time on math, science, reading, and writing. Furthermore, teaching cursive at an older age can be done, but it is not generally enjoyable as it is for children.  It makes children feel grown-up, and they enjoy learning it.

–Lynne Diligent

What Happened to Centigrade? Confusion Over the Celsius Temperature Scale…

February 14, 2013

thermometer When I started teaching elementary school (as a second career in 1995), I was very surprised to find all the new textbooks now referring to the centigrade scale as the Celsius scale. Of course they are the same thing, but I wondered why the textbooks were now using this term when I had never heard it growing up. Now, I know why.

The short answer is that people continue to call a thing by the same name they, themselves, learned while growing up.  Most adults, and just about everyone in academia through the 1980s, grew up hearing “centigrade” and continued to use that term with their own students throughout high school and university.

The new name, “Celsius,” disturbed me ever since I began hearing it in the mid-1990s; but now that I know there was an actual reason for the name change, it no longer bothers me.  A unit of measurement, called a “grade,” was actually in use.  Therefore, in 1948, the Conference General de Pois et Measures (in France) decided to change the name of the scale to “Celsius.”

The International System of Units

The International System of Units

A second reason for the change in name was that the Conference General de Pois et Measures decided that “All common temperature scales would have their units named after someone closely associated with them; namely, Kelvin, Celsius, Fahrenheit, Réaumur and Rankine.”

The change in elementary-school textbooks began to take place around 1968, and during the 1970s, as districts began to replace their former textbooks.  In the meantime, parents, scientists, and college professors continued to use the name they had grown up with.  Only students born in the 1970s and later would have grown up calling the scale “Celsius.”  (I continue to catch myself saying “centigrade” to my own students.)

In England, the BBC Weather did not begin using the term Celsius until 1985, and the word centigrade continues to to be commonly used in England, according to some sources.

Swedish Astronomer Anders Celsius (1701-1744)

Swedish Astronomer Anders Celsius (1701-1744)

The centigrade scale was known as such from 1743-1954.  In 1948, the scale was renamed the Celsius scale, after the Swedish astronomer Anders Celsius (1701-1744) who developed a SIMILAR scale (but not actually the same scale).  Interestingly, Celsius’ original scale was the reverse of today’s scale; “0” indicated the boiling point of water, while “100” indicated the freezing point of water.

Swedish Zoologist and Botanist Carolus Linnaeus(1708-1777)

Swedish Zoologist and Botanist Carolus Linnaeus(1708-1777)

The Swedish zoologist and botanist, Carolus Linnaeus (1707-1778), remembered for giving us the basis of taxonomy (classification of living things into genus and species), reversed Celsius’ original scale so that “0” indicated the freezing point of water, while “100” indicated the boiling point. As the older generations retire and pass away, the new name change will become universal.  It seems to take about three generations for a name change to really become universally accepted in society.

–Lynne Diligent

“Animals Can’t Think, Because They Don’t Have a Brain,” My Student Said.

January 16, 2013

Animal brains

Here in North Africa, we were discussing organs in animals, and I reminded my student that he’d forgotten to mention the brain.  My 13-year-old student said, “Animals don’t have a brain.”  When I asked why he thought that, he said, “Animals can’t think because they don’t have a brain.”

Even though I told him that most animals do have a brain, the conversation continued to trouble me.  I wondered, “How could an intelligent 13-year-old, who is a good student and reasonably good in science have this idea?”  I decided to speak to a teaching colleague from the local culture.

My colleague suggested that I remind my student of the annual Sheep Sacrifice Festival, where a sheep is  butchered in nearly every home (except the very poor).  He suggested I ask my student if he had remembered eating the sheep’s head, and that inside the head are the brains.


My colleague and my husband (both from the local culture) explained that since there is emphasis here on humans being able to think and reason, and animals just acting on their instincts, so that it’s generally said, “Animals don’t have a mind.”  My student, himself, apparently interpreted that to mean, “Animals don’t have a brain.”

When I spoke about this to my student, he said, “Oh, YES!  I HAVE seen that!”  I explained that every animal needs a brain even to walk around, even to eat, even to see.  He said, “Thank you for explaining this!”

–Lynne Diligent