# Posts

### August 03, 2015

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Nearly 3 years ago to the day, I blogged about leaving room 148. Last summer, everything was packed away due to renovation and construction in our building – so it was essentially another full move. This May, I found out I was moving back down to Room 148 – primarily teaching 9th grade again (yippeee!) as […]

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1:55 AM | There’s nothing like a good joke

We (already!) have a Stat of the Week nomination, for the Herald’s Conservative estimates are that the average man will lose 12,547 umbrellas during his lifetime. At first sight this looks like deadpan humour rather than a statistic, but in that case you’d expect a by-line on the piece. The Google, which knows all and tells […]

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1:37 AM | The Other Other Rope Around The Earth

There's a classic problem: Upon stretching a rope around the Earth,
you find that you have 6 metres excess. So you join the ends, and
then go around the Earth propping up the rope equally everywhere.
How high will it be? An alternative that's been suggested is that
instead of propping it up equally everywhere, just prop it up as
high as possible in one place. But now Bill Mullins has asked me
yet another variant ...

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1:02 AM | Making Warm-Ups Meaningful

I want to be more deliberate with my warm-ups this year. I think warm-ups have three possible purposes: Elicit student thinking (see what they already know, activate prior knowledge) Practice retrieval (spiral review, spaced practice) Give feedback (review homework, circle back to prior work) I’m going to dispense with #3 for the purpose of this post. My goal […]

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12:15 AM | Warm-Ups 2.0

Back at the end January, I created (i.e. compiled from all the great stuff out there) a set of warm-ups which I used in one of my classes last semester. Each student received a duo-tang* on the first day of classes with all 18 weeks of warm ups. These did not leave the classroom.I have updated my warm-ups to include Which One Doesn't Belong?, Open Middle, along with better balance benders. There are also now quadratic visual patterns thrown in from week 6.Here is the DropBox link to the Word
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12:02 AM | On This Day in Math - August 3

There are surely worse things than being wrong, and being dull and pedantic are surely among them.Mark Kac The 215th day of the year; There are 215 sequences of four (not necessarily distinct)integers, counting permutations of order as distinct, such that the sum of their reciprocals is 1. Obviously, one of them is 1/4+1/4+1/4+1/4=1. How many can you find?How many solutions with four distinct integers, not counting permutations? EVENTS431 BC Oldest European record of a […]

### August 02, 2015

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Goal 1: Where possible modify and redefine our work using technology. I'm looking at three or four tools for assessments:My number one go-to is Google Forms. There are a couple of things about forms I like. One is that you can use them as generic forms. I can still create the paper copy quizzes - project them, or put a class set of quizzes in sleeves. Students can work out the problems on paper, and enter their answers in the forms. I can get a quick grade using
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10:57 PM | MIQP root

Sometimes I see solver logs that makes me wonder… Here is an example: MIQP Presolve eliminated 1 rows and 1 columns. Reduced MIQP has 3400 rows, 10400 columns, and 2410400 nonzeros. Reduced MIQP has 8000 binaries, 0 generals, 0 SOSs, and 0 indicators. Reduced MIQP objective Q matrix has 2400 nonzeros. Presolve time = 1.77 sec. (674.81 ticks) Probing time = 0.16 sec. (93.32 ticks) Tried
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10:31 PM | Share from Repository (weekly)

How do Unschoolers Turn Out? | MindShift | KQED NewsTags: no_tagPosted from Diigo. The rest of Read on the Web -- Repository group favorite links are here.

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10:15 PM | Laplace great⁶-grand child!

Looking at the Family Tree application (I discovered via Peter Coles’ blog), I just found out that I was Laplace’s [academic] great-great-great-great-great-great-great-grand-child! Through Poisson and Chasles. Going even further, as Simeon Poisson was also advised by Lagrange, my academic lineage reaches Euler and the Bernoullis. Pushing always further, I even found William of Ockham along […]

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[Below is a guest post from Sanjeev Arora on his redesign of the traditional graduate algorithms course to be a better match for today’s students. –Boaz] For the last two years I have tried new ideas in teaching algorithms at the graduate level. The course is directed at first year CS grads, but is also taken by grads […]

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9:34 PM | The Road Back to Higher Education

In 2012, I left Higher Education to work in the software world. It was bittersweet, because I had finished a Ph.D. on Higher Education Leadership only one year before I left. My decision to leave was a hard one, but I couldn’t see an effective solution path to change learning within traditional higher education. I […]

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On Thursday Aug 6 there will be Republican debate among 10 of the 17 (yes 17) candidates for the republican nomination.1) There are 17 candidates. Here is how I remember them: I think of the map of the US and go down the east coast, then over to Texas then up. That only works for the candidates that are or were Senators or Govenors. I THEN listthe outsiders. Hence my order is (listing their last job in government) George Pataki (Gov-NY), Chris Christie (Gov-NY), Rick Santorum […]

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8:44 PM | #MTBoSBlaugust 2: Classroom Poster

Using your school mascot, create an acrostic of character traits you wish to instill in your students ...I've been working on posters for my classroom, so this #MTBoSBlaugust prompt seemed timely! I'm thinking about using VistaPrint or BestValueCopy for the final print!

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8:38 PM | Series 7: Any ~Qs

ANY Qbars (Q ̅) INDEX(No knowledge of Series 6 required to follow along!)7.1 : Hi/Lo7.2 : Y-Not7.3 :

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The movie Mean Girls (2004) featured a fictional math competition between high school students in Illinois. There is actually a pretty difficult question concerning limits shown in the film (and to their credit, they got the answer correct). Here are the 3 problems they asked. Question 1 Twice the larger of two numbers is three … Continue reading Mean Girls Math Questions – Sunday Puzzle

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Each week, we would like to invite readers of Stats Chat to submit nominations for our Stat of the Week competition and be in with the chance to win an iTunes voucher. Here’s how it works: Anyone may add a comment on this post to nominate their Stat of the Week candidate before midday Friday […]

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If you’d like to comment on or debate any of this week’s Stat of the Week nominations, please do so below!

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7:50 PM | Kvantik 2013

My post with Kvantik’s 2012 problems for middle school was a success. So I scanned the 2013 issues and found 7 more problems that I liked. Here are two cute problems I’ve seen before: Problem 1. In the equation 30 − 33 = 3 move one digit to make it correct. Problem 2. A patient […]

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7:45 PM | More Shiny Hacks

In a previous entry, I posted code for hack I came up with to add vertical scrolling to the sidebar of a web-based application I'm developing in Shiny (using shinydashboard). Since then, I've bumped into two more issues, leading to two more hacks that I'll describe here.First, I should point out that I'm using the DT 0.1, shiny 0.12.1 and shinydashboard 0.5.0 packages. DT provides an interface to the DataTables JavaScript library, which handles rendering and processing of the table in the […]

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By: Samir Chopra CS Lewis' Mere Christianity is rightly acknowledged as a masterpiece of Christian apologetics; it is entertaining, witty, well-written, clearly composed by a man of immense learning and erudition (who, as befitting the author of the masterful Studies in Words, cannot restrain his delightful habit of providing impromptu...

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7:34 PM | Meshuggah and Penrose triangle

Meshuggah and Penrose triangle
by Art de Pique Tattoo Studio
http://im-possible.info/english/art/misc/tattoo/art-de-pique.html
Author - https://instagram.com/art_de_pique_tattoo_studio/

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7:29 PM | Movie Popcorn

I ordered a small popcorn at the movie theater and the cashier asked me if I'd like the large size for only $1 more. I knew that this had to be the better deal, so I took it. I mean, what if I had gotten the small popcorn and ran out during the movie? That would be unacceptable.However, as I left the theater, I noticed that I didn't actually eat all of the popcorn. There was about two and a half inches of popcorn left at the bottom of the bucket. I could take it home with me, but stale popcorn
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6:43 PM | Soft Circuits Workshop

Attended a workshop on July 29 titled To Code and Beyond: Soft Circuits. Workshop was led by Dr. Kylie Peppler of Indiana University.It was a rushed four hours, but I'm excited to further explore the concepts and techniques I heard about. First off, soft circuits is related to physical computing. We worked with electronic and electrical components attached to textiles (felt and t-shirts) using conductive thread connect piece to piece. There is a lot more subtlety to the concept that can be […]

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6:20 PM | Countdown to Day 1

Just in case the first day of school is a madhouse (no way!), I decided to post my plans. Mostly so I can have the illusion of control, because everything is going to go perfectly! Actually, I want to look back to see if what I said I would do actually came true. It’s sort of like […]

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6:00 PM | All Liar, No Paradox • Comment 1

A statement asserts that a statement is a statement that is false. The statement violates an axiom of logic, so it doesn’t really matter whether the ostensible statement the so-called liar, really is a statement or has a truth value. … Continue reading →

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6:00 PM | Bits, bears, and beyond in Banff

Another conference about entropy. Another graveyard. Last year, I blogged about the University of Cambridge cemetery visited by participants in the conference “Eddington and Wheeler: Information and Interaction.” We’d lectured each other about entropy–a quantification of decay, of the march of … Continue reading →

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5:51 PM | Carmella Kalai (1926-2015)

My beloved mother Carmella Kalai passed away last week. With me, 1956 My father Hanoch Kalai, my mother Carmella, My sister Tamar (Tami) and me around 1957). Photos from the 80s and 20s. Chess-set based on masks

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Astronomer Caroline Herschel observed her first comet on 1 August 1786 an anniversary that was celebrated by various people on Twitter yesterday. Unfortunately many of them, including for example NASA History Office (@NASAhistory), claimed that on this date she became … Continue reading →