# Posts

### July 29, 2014

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Complete show on YouTube. In case you were wondering what the fuss was about.

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Ramsey Musallam, chemistry teacher from San Francisco, California, talks about 3 rules to spark learning: (1) curiosity comes first, (2) embrace the mess, (3) practice reflection. Even though he is a chemistry teacher, these rules are clearly applicable to all subjects especially mathematics. Curiosity is the reason why mathematical conjectures are made and theorems are proved. The […]
Math and Multimedia - School math, multimedia, and technology tutorials.

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Many workers are now directly responsible for their financial well-being. Most individual investors are not sufficiently well-informed on financial matters, and thus often make less-than-optimal choices in managing their retirement.

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Mesmerizing Interiors Of Iran’s Mosques Captured In Rare Photographs By Mohammad Domiri
Mohammad Domiri, a talented architectural photographer from northern Iran, takes stunning photos of grandiose mosque architecture throughout the Middle East.
Middle Eastern architecture is often recognized by its elegantly curved arches and spiraling columns, which feature heavily throughout Domiri’s photos. Many of the historic sites Domiri shoots are decorated with colorful stained-glass
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“How many and which ant species are being accidentally moved around the world?,” published in 2013, has been retracted because the authors “used a wrong list of species and omitted to include a reference.” The authors claim that this affected the magnitude of the issue, but not the overall conclusion. The paper was written up by […]

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3:00 PM | Obligatory #TMC14 Recap Thing

It's been a year. Time to recap the best math professional development game in town. In summary, I had a fantastic time.
Exactly. To the recap!SessionsAlgebra TwoEarlier in the year in the speaker proposal phase, there were requests to hear about my kooky Algebra II idea from last summer, now that real kids had helped me troubleshoot it. I submitted it as an independent session, but it worked better to integrate it in the general purpose Algebra II
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Quick Derivation of Newton's Law of Gravity A simple way to think about the gravitational field of an object is to imagine a fixed number of "lines of force" that radiate from the object evenly into space. Let's suppose the number of lines of force produced by an object depend only on its mass, so.. n=k*m where n is the number of lines of force produced by the mass m and k is a constant. Now assume the density of the lines at any given point in space represents the strength of the
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2:57 PM | Lizard Grow

My son was given this lizard as a big brother gift (can’t find online link to product, but here’s a similar toy). Thoughts? Original Size Size After 2 Day Soak Before Measurements Left image Length: 905 pixels Width (between front … Continue reading →

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2:56 PM | Quiz: What Advertisers Know About You

Advertisers know a lot about us. Everything from the products we buy to where we access the Internet leaves a trail of information. Advertisers surmise a lot about us based on other people who buy the same things and live in the same places.

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2:51 PM | Equazione di secondo grado con parametro

Equazione di secondo grado contenente un parametro. Spiegazione con esercizi risolti. Un’equazione di secondo grado si dice parametrica quando i coefficienti dell’equazione sono letterali (ovvero non sono tutti numerici) e tali lettere (e non l’incognita) devono soddisfare determinate condizioni.Si studiano i valori che tali lettere, dette parametri, devono avere per rendere vere le condizioni richieste […]

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2:51 PM | pi in Binary

pi in Binary Take any circle, measure the length of its circumference then measure the length of its diameter and divide the two numbers. You get pi, probably the most famous number in all of mathematics and known for several thousand years. pi=circumference/diameter pi=3.1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 8214808651 3282306647 0938446095 5058223172 5359408128 4811174502 8410270193 8521105559 6446229489 5493038196
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2:49 PM | Making the Change Happen

And for her next feat, our heroine figures out what the heck happened over the last few years. On Saturday afternoon at Twitter Math Camp, we have flex sessions. One of those sessions was about how to deal with resistance to change. I think the original thought was to talk about dealing with that …Continue reading

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I’m not even kidding guys…I already ordered 2!
A Multi-Function Clip That Hides a Toolbox In Your Hair
Andrew Liszewski
A Leatherman multi-tool hanging off your belt is a great way to stay prepared for emergencies, but it means you look like someone with a Leatherman hanging off their belt—and that part’s not so great. This innocuous hair clip is a better alternative. It manages to replicate the functionality of quite a few tools, but will all but disappear when used to keep your bangs
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Three Ways to Define a Prime Number and The First 100 Primes An integer n is a prime number if it has no divisors (except for 1 and itself). Another way to say this is that a set of n objects cannot be broken into pieces of equal size. Or you could say that the equation n=a*b can never be true, where a and b are integers. Beginners sometimes get confused by the term "divisor". When mathematicians say that one integer divides another integer they mean with no remainder. Prime numbers are
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2:42 PM | The Mystery of Ramanujan and Hardy

The Mystery of Ramanujan and Hardy On 16 January 1913, Srinivasa Ramanujan wrote to G. H. Hardy. Ramanujan was a self taught mathematician from a small village in India. He had almost no formal training in mathematics. Hardy was professor of mathematics at Cambridge University and one of the leading mathematicians in the world. The letter sent by Ramanujan contained a sampling of theorems he had discovered. Hardy later said, "the theorems defeated me completely; I had never seen anything in
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2:40 PM | Dimension in Physics Explained

Dimension in Physics Explained Is Dimension really a fundamental concept in Physics? Maybe, maybe not, consider this.. A simple way to think about the gravitational field of an object is to imagine a fixed number of "lines of force" that radiate from the object evenly into space. The density of the lines at any given point in space represents the strength of the gravitational field at that point. Now, with this simple model in mind, we write down Newton's famous formula for the gravitational
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How religious Americans are remains a key predictor of their political identification, though the pattern is strongest among non-Hispanic whites, according to a poll by Gallup.

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2:07 PM | Groeiprocessen

voorkennisevenredig en omgekeerd evenrediglogaritmische schalentoepassingen van logaritmengeremde groeiIk geloof dat de 'samenvatting' HAVO 4 wiskunde D klaar is. Met het laatste hoofdstuk over groeiprocessen houd ik het voor gezien. Het lijkt me erg handig:-)

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Hello, my name is Barrett Leslie, and I am in the final year of the Illinois Tech undergraduate AMAT program. I was chosen to be this year’s chapter representative for AN14, and I got to experience an activity-packed week, some of which I’d like to share with you. The week started for me on Monday [...]

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1:56 PM | STEMtistics: STEM facts you can use!

As summer blazes on and we move closer to our favorite time of year - back-to-school! - we here at CTEq thought that you, our fellow STEMthusiasts, might need a daily dose of awesome STEM facts to carry you into August. For that reason, we're serving up some of our favorite STEMtistics every day through next week! Tags: STEMtistics, STEM degrees, engineering, higher education, STEM & the states, minorities, women & girls, Vital Signs, computer science

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All measures of programming language popularity are indirect and controversial. There’s no consensus on the best way to measure popularity, even if we could gather any data we want. Still, measures of popularity based on data, especially combining several kinds of data, are more useful than personal impressions. According to the normalized comparison chart on […]

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1:05 PM | Rational Function Headbandz

TL;DR: An interactive activity having kids ask each other questions to guess the rational function graph they have on their foreheads. *** I’m going to make a short post inspired by Twitter Math Camp 2013 (TMC13), rather than TMC14. Both @calcdave and I led morning sessions for precalculus teachers. Through that morning session, some nice […]

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12:43 PM | Stark effect: tunnelling probability

References: Griffiths, David J. (2005), Introduction to Quantum Mechanics, 2nd Edition; Pearson Education – Problem 8.16. Earlier, we analyzed the Stark effect in hydrogen using perturbation theory. The Stark effect causes a splitting of the spectral lines of hydrogen when an external electric field is applied. In our earlier post, we did a ‘proper’ analysis […]

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An expression of concern has been issued for the second of three papers on the idea that, if you have three positive emotions for every negative one, you will be more successful in life. Psychologist Barbara Fredrickson, of the University of North Carolina, Chapel Hill, has spent the last decade building a brand around this ratio, […]

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12:15 PM | Golf and TMC

Last week I attended Twitter Math Camp (yes, that’s a real thing). In my conversations with other attendees, we frequently ended up talking about how intimidating it felt being in the company of the other TMCers. This was a passionate and committed group of professionals sharing their best stuff. It was easy to be in awe […]

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11:46 AM | (In) Person Power [TMC14 Recap #1]

Last week I drove 22 hours round trip to be at my first Twitter Math Camp (TMC) for three days. During that time I co-led a morning session with Christopher Danielson (two hours a day over three days) focused on embodied mathematics both at body- and hand-scale. You can read the Storify recap I created to get a sense of some of the things we did. I think it captures the spirit of TMC as a whole -- focused, intense and active with moments of pure hilarity.I also instigated the after hours event […]

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11:15 AM | Golden-Oldie(s)

Re-visiting some old faves today…:Yesterday Presh Talwalkar covered one of my favorite math puzzles with a sort of update using the real-life example of Nigeria:http://mindyourdecisions.com/blog/2014/07/28/monday-puzzle-nigerias-sex-ratio/#.U9ZpW6jrnKkI covered this math conundrum a couple of years back when Richard Wiseman ran it as one of his Friday puzzles:http://richardwiseman.wordpress.com/2012/01/16/answer-to-the-friday-puzzle-139/Here is Richard's verbatim statement of the puzzle:
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11:12 AM | The problem with charter schools

Today I read this article written by Allie Gross (hat tip Suresh Naidu), a former Teach for America teacher whose former idealism has long been replaced by her experiences in the reality of education in this country. Her article is entitled The Charter School Profiteers. It’s really important, and really well written, and just one of […]