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# Posts

### May 30, 2015

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As promised, Michael LaCour, the co-author of the now-retracted Science paper on gay canvassing, has posted a detailed response to the allegations against him. In the 23-page document — available here — LaCour claims to introduce evidence uncovering discrepancies between the timeline of events presented in Broockman et al. (2015) and the actual timeline of […] The post Data “were destroyed due to privacy/confidentiality requirements,” says co-author of retracted […]
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I have been invited to write a few posts for NCTM’s Mathematics Teacher Blog: Joy and Inspiration in the Mathematics Classroom. You can read my first post here. While you’re there, be sure to catch up on any other posts you haven’t read. There are some great ones by Matt Enlow, Chris Harrow, and Kathy Erickson. […]
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curiosamathematica: A variation of the more famous Mandelbrot fractal equations results in the equally beautiful burning ship fractal. Holy shit this is creepy.
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Urged on by colleagues and bolstered by the number of hits I'm getting for all of my Regents exam blog posts in these days leading up to the next round of testing, I decided to collect the Algebra 1 (Common Core) tests together under in one volume, along with my answers and explanations. It's a first try, and it may not go as well as I would have liked. I will be honest: I pushed this as hard and fast as I could, while still taking time to review it for errors. However, I had a deadline: the […]
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mathani: When the equilateral triangle and the deltoids on top of it have the same height, the ratio of their areas is 1 : 3 : 5 : 7 : 9. What if the shapes telescope so that their areas are the same. What is the ratio of their heights then?

### May 29, 2015

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The past two years I’ve used standards based grading (SBG). Last year I did a drastic overhaul. At the end of this year (when I had time again!) I started re-reading many of the blogs that originally got me onto … Continue reading →
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I shared this video with students and parents, with shout-outs on Twitter to many featured digital tools and resources that have become a regular part of my practice.  Thanks to every one of these tools, and the folks that keep … Continue reading →
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The best review of arithmetic consists in the study of algebra.~Florian CajoriThe 150th day of the year; 150 is the largest gap between consecutive twin prime pairs less than a thousand. It occurs between {659, 661} and {809, 811}. *Prime CuriosA Poly divisible number is an n-digit number so that for the first digit is divisible by one, the first two digits are divisible by two, the first three digits are divisible by three, etc up to n. There are 150 three-digit poly divisible numbers. […]
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Things have gotten busy over at the food blog. The plan was always to go hot and heavy for a month or two. With almost one hundred posts either up or in the queue, I think we're getting there.The content is a mix of new pieces (like the recent one on chickenless chicken and black bean soup), reposts, links to recent news of interest... And lots of historical pieces. Some, like this WWII film (highly recommended for anyone interested in the history of nutrition), focus on how we think about […]
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O, the bittersweet feeling of the end of the school year. So much happiness to be done with the exhausting cycle of teaching and grading, but so sad to see many students graduating and leaving your classes. These last five … Continue reading →
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Some rings and their stand from the walls and doors of the city of Siena.Filed under: Kids, pictures, Travel, Wines Tagged: Italia, medieval architecture, Siena, Tuscany, wall ring
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Well, this blog has started to go in the games direction, and maybe this will continue to do so. For example, I've still not written about three- or more-player games (which usually have some element of chance)... but maybe I'll never will.Still, I could write about more wisdom about the way of producing enjoyable two-player games... but maybe I'll never will.I could also show the improvement of my own collection of one-player logic toys and puzzles on photos, but I decided not to do so, […]
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I was recently watching a choral counting video of a colleague teaching a small group of Spanish-English bilingual second graders (I'll share the video if I get permission, but in the meantime, just imagine some cute kids counting up by 10s starting at 64). Students count pretty fluently from 224 to 294, and there's just the tiniest pause before they all say 304. It's common for students to hesitate at points like this where numbers "cross over" the hundreds (is there better language to […]
Editor's Pick
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This past week, on May 23, 2015, the much loved and respected John F. Nash Jr., along with his wife, Alicia Nash, passed away in a tragic car accident while returning home from his receipt of the 2015 Abel Prize for his work in partial differential equations. The Nobel winner and his wife were the [...]
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How many trips does it take to mow this lawn?   It is half a city block which measures 330′ x 165′.  My mower deck is 48″. 165′ x 12″ = 1,980″ 1,980″ / 48″ = 41.25 It takes just over 41 mower decks to cut lawn.  Depending on the student, a trip will include […]
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Screenshots from Constantine TV series (season 1, episode 1)   http://im-possible.info/english/art/films/constantine.html
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Wow, it has been a while since I posted anything, and I need to share a ton of things I have done. I predict that I will post a lot in the next several weeks. The school year is winding down, but my learners are ramping up. Grad school is down for the summer (with [...]
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Victor Piercey of Ferris State University shares his thoughts and experiences on inquiry-based learning in mathematics and what he and his students have learned through the use of IBL.
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Vor einigen Tagen beschrieb Arne Ulbricht in der SPIEGEL-Online Sparte, er entspräche in seinem Berufsbild dem Kumpeltyp und würde zuweilen mit der fehlenden Distanz zu den Schülern kämpfen.  Als Schüler lag ich einer Englisch-Referendarin zu Füßen. Alle Jungs taten das.  Die Frage von Nähe und Distanz zu den Schülern – … Continue reading →
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Forget devising the exact location of atoms, people, computing unimaginable quantum mechanical probability distributions, what if compressive sensing enabled us to figure out how to extend the lifetime of our smartphone batteries ? This is what this uncertainty quantification study using compressive sensing tries to do. Figure from this tweet.On Uncertainty Quantification of Lithium-ion Batteries by Mohammad Hadigol, Kurt Maute, Alireza Doostan In this work, a stochastic, physics-based model […]
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"Già abbiamo una certa idea della topografia del Lager; questo nostro Lager è un quadrato di circa seicento metri di lato, circondato da due reticolati di filo spinato, il più interno dei quali è percorso da corrente ad alta tensione. È costituito da sessanta baracche in legno, che qui chiamano Blocks, di cui una decina in costruzione; a queste vanno aggiunti il corpo delle cucine, che è in muratura; una fattoria sperimentale, gestita da un distaccamento di Häftlinge [= prigionieri, […]
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