MetaFilter posts tagged with math
http://www.metafilter.com/tags/math
Posts tagged with 'math' at MetaFilter.Wed, 23 Sep 2015 19:24:49 -0800Wed, 23 Sep 2015 19:24:49 -0800en-ushttp://blogs.law.harvard.edu/tech/rss60Learning common core math with a check written by an upset father
http://www.metafilter.com/153278/Learning%2Dcommon%2Dcore%2Dmath%2Dwith%2Da%2Dcheck%2Dwritten%2Dby%2Dan%2Dupset%2Dfather
When the father of a second grader got annoyed by <a href="http://www.corestandards.org/Math/">common core math</a> tools (namely, <a href="https://www.youtube.com/watch?v=p6RaMGDPfJg">ten frame cards</a>), his annoyance went viral when <a href="http://www.buzzfeed.com/morganshanahan/this-dad-wrote-a-check-to-his-kids-school-in-common-core-mat">he wrote a check to his student's school using common core numbers</a>. Then <a href="http://www.patheos.com/blogs/friendlyatheist/2015/09/21/the-dad-who-wrote-a-check-using-common-core-math-doesnt-know-what-hes-talking-about/">the Friendly Athiest on Patheos used that check to teach how common core math works</a> at the second grade level. tag:metafilter.com,2015:site.153278Wed, 23 Sep 2015 19:24:49 -0800filthy light thiefFun math for kids
http://www.metafilter.com/153162/Fun%2Dmath%2Dfor%2Dkids
<a href="https://liorpachter.wordpress.com/2015/09/20/unsolved-problems-with-the-common-core/">Unsolved problems with the common core.</a> Computational biologist (and <a href="http://www.metafilter.com/136576/Network-Nonsense">occasional curmudgeon</a>) Lior Pachter pairs <a href="https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_mathematics">unsolved problems in mathematics</a> to <a href="http://www.corestandards.org/">common core</a> math standards. tag:metafilter.com,2015:site.153162Sun, 20 Sep 2015 13:39:04 -0800quaking fajitaSteve Martin and Robin Williams Riffing on Mathematics
http://www.metafilter.com/153158/Steve%2DMartin%2Dand%2DRobin%2DWilliams%2DRiffing%2Don%2DMathematics
In 2002, Steve Martin sat down for a Q&A about his writing and his interest in mathematics. His friend Robin Williams was on hand to help out. Please pardon the video quality. <a href="https://www.youtube.com/watch?v=FHW45zw23gU">Part 1</a> <a href="https://www.youtube.com/watch?v=wACvhOhHGtU">Part 2</a> <a href="https://www.youtube.com/watch?v=Ai22mQ0zgPo">Part 3</a> <a href="https://www.youtube.com/watch?v=H3xtxE7sw30">Part 4</a> <a href="https://www.youtube.com/watch?v=Jka1yA5O_eU">Part 5</a> tag:metafilter.com,2015:site.153158Sun, 20 Sep 2015 04:04:53 -0800OptamysticYou sank my battleship... with probability!
http://www.metafilter.com/153068/You%2Dsank%2Dmy%2Dbattleship%2Dwith%2Dprobability
<a href="http://cliambrown.com/battleship/">Battleship Probability Calculator</a> by C. Liam Brown. Finds the best squares to try during the game. tag:metafilter.com,2015:site.153068Thu, 17 Sep 2015 06:11:08 -0800WolfdogInspired by mathematical theorems or open problems...
http://www.metafilter.com/152812/Inspired%2Dby%2Dmathematical%2Dtheorems%2Dor%2Dopen%2Dproblems
<a href="http://erikdemaine.org/fonts/conveyer/?text=MetaFilter" title="don't overlook the 'Show Belt' checkbox">Conveyer Belt Font.</a> More <a href="http://erikdemaine.org/fonts/">mathematical and puzzle fonts/typefaces</a> you can play with in your browser. Read about them in the article <a href="http://arxiv.org/pdf/1404.1775v2.pdf">Fun with Fonts: Algorithmic Typography.</a> [PDF] tag:metafilter.com,2015:site.152812Tue, 08 Sep 2015 06:40:06 -0800Wolfdoga(n)=a(n−1)+gcd(n,a(n−1)).
http://www.metafilter.com/152780/anan1gcdnan1
<a href="http://bit-player.org/2015/pumping-the-primes">Go ahead: Press the button.</a> <i> A number is printed on the tape. Press again and another number appears. Keep going. A few more. Notice anything special about those numbers? The sequence begins: 5, 3, 11, 3, 23, 3, 47, 3, 5, 3, 101, 3, 7, 11, 3, 13, 233, 3, 467, 3, 5, 3, . . . </i> tag:metafilter.com,2015:site.152780Sun, 06 Sep 2015 16:30:52 -0800WolfdogCan you add faster than a 5 year old
http://www.metafilter.com/152276/Can%2Dyou%2Dadd%2Dfaster%2Dthan%2Da%2D5%2Dyear%2Dold
CMA is a "brain development program designed to develop higher learning capability and aims to promote mental arithmetic, enhance memory, boost creativity, and increase focus using the principle of Abacus". <a href="https://www.youtube.com/watch?v=MYUcsqx5Bh4">Watch some kids from The Philippines calculates in seconds, using their fingers.</a> (SLYT) tag:metafilter.com,2015:site.152276Thu, 20 Aug 2015 08:25:27 -0800growabrainCosmic Call
http://www.metafilter.com/152016/Cosmic%2DCall
"In 1999, two Canadian astrophysicists, Stéphane Dumas and Yvan Dutil, composed and sent a message into space. The message was composed of <a href="http://pic.blog.plover.com/aliens/dd/index.html">twenty-three pages of bitmapped data</a>, and was sent from the RT-70 radio telescope in Yevpatoria, Ukraine, as part of a set of messages called Cosmic Call." Over the next few weeks, Mark Jason Dominus is writing a series of articles to his blog exploring each of the 23 images. Can you decode their information before reading his explanations?
Three articles are already published:
<ul>
<li><a href="http://blog.plover.com/aliens/dd/intro.html">Introduction</a> (spoiler-free)</li>
<li><a href="http://blog.plover.com/aliens/dd/p00.html">Part 0/23</a> (SPOILERS)</li>
<li><a href="http://blog.plover.com/aliens/dd/p01.html">Part 1/23</a> (SPOILERS)</li>
</ul>
(Cosmic Call and other CETI messages <a href="https://www.metafilter.com/86929/35-years-of-shouting-into-the-abyss">previously</a> on MeFi.) tag:metafilter.com,2015:site.152016Tue, 11 Aug 2015 16:16:23 -0800mbrubeckNew Pentagons
http://www.metafilter.com/152010/New%2DPentagons
<a href="http://www.theguardian.com/science/alexs-adventures-in-numberland/2015/aug/10/attack-on-the-pentagon-results-in-discovery-of-new-mathematical-tile">Mathematicians discover a new type of pentagon that can cover the plane leaving no gaps and with no overlaps.</a> It becomes only the 15th type of pentagon known that can do this, and the first discovered in 30 years. Previously on Mefi: <a href="http://www.metafilter.com/146120/No-Pentagons">No Pentagons</a> (main link isn't working, but check out <a href="https://plus.maths.org/content/trouble-five">The Trouble with Five</a> and <a href="http://mathmunch.org/2013/02/25/marjorie-rice-inspired-by-math-and-subways">this article on Marjorie Rice</a>, an amateur mathematician who discovered four of the 15 known pentagonal tilings, linked in the comments.)
Bonus for '80s math-nerd kids: <a href="https://www.youtube.com/watch?v=sFwSpw7Bv3s">"Tessellations" song from Square One Television.</a> Ooh-bop-bop-ooh! tag:metafilter.com,2015:site.152010Tue, 11 Aug 2015 11:50:26 -0800Metroid BabyOne Way or Another
http://www.metafilter.com/151944/One%2DWay%2Dor%2DAnother
"In a patent dispute between two pharmaceutical giants arguing over who owns the royalty rights to a lucrative wound-dressing solution, their lordships sat in judgment over an issue that would have tested the mettle of the finest mathematical logicians; <a href="http://www.independent.co.uk/news/science/what-exactly-does-one-mean-court-of-appeal-passes-judgement-on-thorny-mathematical-issue-10350568.html">and in the process coined a new legal definition of "one"</a>." "A previous judgment in 2013 ruled in Smith & Nephew's favour because of a mathematical quirk known among chemists as the "significant figures rule", which is a way of taking into account errors of measurement.
...So in this earlier judgment "one" meant anything greater than or equal to 0.95 and less than 1.5, which produced an uncomfortable asymmetry that did not go unnoticed in last week's judgment. How could "one" include something that is 0.05 less but also include something that is nearly ten times this figure more – for instance 0.49 more than 1?" tag:metafilter.com,2015:site.151944Sat, 08 Aug 2015 14:24:46 -0800not_the_waterFamous Fluid Equations Are Incomplete
http://www.metafilter.com/151640/Famous%2DFluid%2DEquations%2DAre%2DIncomplete
<a href="http://www.nytimes.com/2015/07/26/magazine/the-singular-mind-of-terry-tao.html">The Singular Mind of Terry Tao</a> - "<a href="http://thecolbertreport.cc.com/guests/terence-tao/6wtwlg/terence-tao">Imagine</a>, <a href="http://www.smh.com.au/good-weekend/terence-tao-the-mozart-of-maths-20150306-13fwcv.html">he said</a>, that <a href="http://bactra.org/notebooks/tsallis.html">someone awfully clever</a> could <a href="https://en.wikipedia.org/wiki/MONIAC_Computer">construct a machine</a> out of pure water. It would be built not of rods and gears but <a href="http://paulromer.net/why-information-grows/">from a pattern</a> of interacting currents." (<a href="https://twitter.com/Noahpinion/status/624664545995264000">via</a>) <blockquote>Tao has emerged as one of the field's great bridge-builders. At the time of his Fields Medal, he had already made discoveries with more than 30 different collaborators. Since then, he has also become a prolific math blogger with a decidedly non-Gaussian ebullience: He celebrates the work of others, shares favorite tricks, documents his progress and delights at any corrections that follow in the comments. He has organized cooperative online efforts to work on problems. "Terry is what a great 21st-century mathematician looks like," [<a href="http://www.metafilter.com/user/21049">mefi's</a> <a href="http://projects.metafilter.com/4308/How-Not-To-Be-Wrong">own</a>] Jordan Ellenberg, a mathematician at the University of Wisconsin, Madison, who has collaborated with Tao, told me. He is "part of a network, always communicating, always connecting what he is doing with what other people are doing."</blockquote>
<a href="https://plus.google.com/117663015413546257905/posts/EVYdMhSqtWu">also btw</a>...
<a href="https://www.quantamagazine.org/20150721-famous-fluid-equations-are-incomplete/">A 115-year effort to bridge the particle and fluid descriptions of nature has led mathematicians to an unexpected answer</a> - "The evidence suggests that truer equations of fluid dynamics can be found in a little-known, relatively unheralded theory developed by the Dutch mathematician and physicist <a href="https://en.wikipedia.org/wiki/Diederik_Korteweg">Diederik Korteweg</a> in the early 1900s. And yet, for some gases, even the Korteweg equations fall short, and there is no fluid picture at all." tag:metafilter.com,2015:site.151640Wed, 29 Jul 2015 00:34:29 -0800kliulessLoop - Pool on an elliptical table
http://www.metafilter.com/151559/Loop%2DPool%2Don%2Dan%2Delliptical%2Dtable
<a href="http://www.loop-the-game.com">Loop - Pool on an elliptical table.</a> <i>The ellipse has two significant points, called focuses, which have a remarkable geometrical property that is almost always explained using the example of an imaginary pool table.
"If a pool table is the shape of an ellipse, then a ball shot from one focus will always rebound to the other focus no matter in which direction the ball is shot."
That sounded interesting! Wouldn't it be fun, I thought, if I could build one of these imaginary tables?
<a href="http://www.theguardian.com/science/alexs-adventures-in-numberland/2015/jul/16/loop-new-cue-sport-pool-ellipse-elliptical">So I did</a>.</i> tag:metafilter.com,2015:site.151559Sun, 26 Jul 2015 13:54:00 -0800dng"Their little heads are exploding"
http://www.metafilter.com/150636/Their%2Dlittle%2Dheads%2Dare%2Dexploding
<a href="http://bit-player.org/2015/mrs-nguyens-prestidigitation">Mrs. Nguyen's Prestidigitation</a> <i>From a set of 1 through 9 playing cards, I draw five cards and get cards showing 8, 4, 2, 7, and 5. I ask my 6th graders to make a 3-digit number and a 2-digit number that would yield the greatest product...</i> and somehow we end up with lacing diagrams and Python. (<a href="http://fawnnguyen.com/multiplication-finding-the-greatest-product/">The original post on Fawn Nguyen's blog</a>) tag:metafilter.com,2015:site.150636Mon, 22 Jun 2015 06:45:32 -0800WolfdogTime with class! Let's Count!
http://www.metafilter.com/150420/Time%2Dwith%2Dclass%2DLets%2DCount
<a href="https://www.youtube.com/watch?v=Q4gTV4r0zRs">I want to demonstrate how amazing combinatorial explosion is! Please don't stop me. </a> An animation about numbers that get large. It has a happy ending and possibly even a moral. About those "latest algorithmic techniques" mentioned at the end: <a href="http://www-alg.ist.hokudai.ac.jp/~thomas/TCSTR/tcstr_13_64/tcstr_13_64.pdf">Efficient Computation of the Number of Paths in a Grid Graph with Minimal Perfect Hash Functions</a> [PDF] tag:metafilter.com,2015:site.150420Fri, 12 Jun 2015 11:44:44 -0800WolfdogHoTT Coq
http://www.metafilter.com/150345/HoTT%2DCoq
<a href="https://www.quantamagazine.org/20150519-will-computers-redefine-the-roots-of-math/">Univalent Foundations Redefines Mathematics</a> - "When a legendary mathematician found a mistake in his own work, he embarked on a computer-aided quest to eliminate human error. To succeed, he has to <a href="http://homotopytypetheory.org/book/">rewrite the century-old rules</a> underlying all of mathematics." (<a href="http://www.metafilter.com/126041/Computerized-Math-Formal-Proofs-andamp-Alternative-Logic">previously</a>) <a href="http://www.ams.org/notices/201309/rnoti-p1164.pdf">Voevodsky's Univalence Axiom in Homotopy Type Theory</a>
<blockquote>One of Voevodsky's goals (<a href="https://intelligence.org/2014/02/21/john-baez-on-research-tactics/">as we understand it</a>) is that, in a not too distant future, mathematicians will be able to verify the correctness of their own papers by working <a href="http://math.andrej.com/2014/01/13/univalent-foundations-subsume-classical-mathematics/">within the system of univalent foundations</a> formalized in a proof assistant and that doing so will become natural even for pure mathematicians (the same way that most mathematicians now typeset their own papers in TeX). We believe that this aspect of the <a href="http://ncatlab.org/nlab/show/univalence+axiom">univalent foundations program</a> distinguishes it from other approaches to foundations by providing a practical utility for the working mathematician.</blockquote>
-<a href="http://www.science4all.org/le-nguyen-hoang/type-theory/">Type Theory: A Modern Computable Paradigm for Math</a>
-<a href="http://www.science4all.org/le-nguyen-hoang/homotopy-type-theory/">Homotopy Type Theory and Higher Inductive Types</a>
-<a href="http://www.science4all.org/le-nguyen-hoang/univalence/">Univalent Foundations of Mathematics</a>
also btw...
-<a href="https://www.youtube.com/watch?v=QNznD9hMEh0">James Simons interview</a>
-<a href="https://mathematicswithoutapologies.wordpress.com/2015/05/13/univalent-foundations-no-comment/">Univalent Foundations: "No Comment."</a> (<a href="http://math-frolic.blogspot.com/2015/05/set-theory-type-theory-hott-univalent.html">via</a>)
-<a href="https://terrytao.wordpress.com/career-advice/there%E2%80%99s-more-to-mathematics-than-rigour-and-proofs/">There's more to mathematics than rigour and proofs</a> tag:metafilter.com,2015:site.150345Tue, 09 Jun 2015 22:40:35 -0800kliulessKeeping It Fair
http://www.metafilter.com/150322/Keeping%2DIt%2DFair
You're sitting down with your friends to play a boardgame, and you find yourself in a conundrum: how do you choose a first player? Sure, you could roll a standard die and take highest number, but what if there's a tie? That could take forever! Besides, wouldn't you rather be mathematically sure that everyone has a fair shot at each spot in the turn order?
<a href="http://www.ericharshbarger.org/dice/go_first_dice.html">Of course you would!</a> tag:metafilter.com,2015:site.150322Tue, 09 Jun 2015 11:16:45 -0800tocts3Blue1Brown: Reminding the world that math makes sense
http://www.metafilter.com/150242/3Blue1Brown%2DReminding%2Dthe%2Dworld%2Dthat%2Dmath%2Dmakes%2Dsense
<a href="https://www.youtube.com/watch?v=F_0yfvm0UoU">Understanding e to the pi i</a> - "<a href="http://www.3blue1brown.com/s/HowToThinkAboutExponentials.pdf">An intuitive explanation</a> as to why <a href="http://www.bbc.co.uk/programmes/b04hz49f" title="Melvyn Bragg and his guests discuss Euler's number, also known as e. First discovered in the seventeenth century by the Swiss mathematician Jacob Bernoulli when he was studying compound interest, e is now recognised as one of the most important and interesting numbers in mathematics. Roughly equal to 2.718, e is useful in studying many everyday situations, from personal savings to epidemics. It also features in Euler's Identity, sometimes described as the most beautiful equation ever written. With: Colva Roney-Dougal, Reader in Pure Mathematics at the University of St Andrews; June Barrow-Green, Senior Lecturer in the History of Maths at the Open University; and Vicky Neale, Whitehead Lecturer at the Mathematical Institute and Balliol College at the University of Oxford.">e</a> to the <a href="http://www.bbc.co.uk/programmes/p004y291" title="Melvyn Bragg and guests discuss the history of the most detailed number in nature. In the Bible's description of Solomon's temple it comes out as three, Archimedes calculated it to the equivalent of 14 decimal places and today's super computers have defined it with an extraordinary degree of accuracy to its first 1.4 trillion digits. It is the longest number in nature and we only need its first 32 figures to calculate the size of the known universe within the accuracy of one proton. We are talking about Pi, 3.14159 etc, the number which describes the ratio of a circle's diameter to its circumference. How has something so commonplace in nature been such a challenge for maths? And what does the oddly ubiquitous nature of Pi tell us about the hidden complexities of our world? With: Robert Kaplan, co-founder of the Maths Circle at Harvard University; Eleanor Robson, Lecturer in the Department of History and Philosophy of Science at Cambridge University; and Ian Stewart, Professor of Mathematics at the University of Warwick.">pi</a> <a href="http://www.bbc.co.uk/programmes/b00tt6b2" title="Melvyn Bragg and his guests discuss imaginary numbers. In the sixteenth century, a group of mathematicians in Bologna found a solution to a problem that had puzzled generations before them: a completely new kind of number. For more than a century this discovery was greeted with such scepticism that the great French thinker Rene Descartes dismissed it as an 'imaginary' number. The name stuck - but so did the numbers. Long dismissed as useless or even fictitious, the imaginary number i and its properties were first explored seriously in the eighteenth century. Today the imaginary numbers are in daily use by engineers, and are vital to our understanding of phenomena including electricity and radio waves. With: Marcus du Sautoy, Professor of Mathematics at Oxford University; Ian Stewart, Emeritus Professor of Mathematics at the University of Warwick; and Caroline Series, Professor of Mathematics at the University of Warwick.">i</a> equals -1 <a href="https://www.youtube.com/watch?v=1rVHLZm5Aho">without a hint</a> of calculus. This is <a href="https://www.youtube.com/watch?v=zLzLxVeqdQg">not your usual</a> Taylor series nonsense." (<a href="https://twitter.com/stevenstrogatz/status/604653212214292481" title="''A star is born.''">via</a> <a href="https://twitter.com/Noahpinion/status/604679198259580928" title="''Best geek video I've seen all week.''">via</a>; <a href="http://www.reddit.com/r/math/comments/2xzzk0/nontaylorseries_explanation_for_eulers_formula/">reddit</a>; <a href="http://www.metafilter.com/89918/Math-is-beautiful">previously</a>) <a href="https://www.youtube.com/channel/UCYO_jab_esuFRV4b17AJtAw">More videos from 3Blue1Brown</a>: "<a href="http://www.3blue1brown.com/">3Blue1Brown</a> is some combination of math and entertainment, depending on your disposition. The goal is for explanations to be <a href="http://www.3blue1brown.com/about/" title="''When the tool I am building for animations becomes something besides a jumble of Python and Duct tape, I'll make it publicly available so that anyone can use it to easily illustrate their own explanations.''">driven by animations</a>, for difficult problems to be made simple with changes in perspective, and for philosophizing to be limited to the brevity and semantic constraints of silly poetry. Basically, math sits in <a href="https://plus.google.com/117663015413546257905/posts/QAhMH35LThk">an ivory tower it built itself out of</a> jargon and impossibly long sequences of (seemingly) logical steps, and I would like to take it out for a walk to <a href="http://wordplay.blogs.nytimes.com/2015/03/09/%CF%80/">meet everyone</a>." tag:metafilter.com,2015:site.150242Sat, 06 Jun 2015 11:42:18 -0800kliulessThe toilet seat: up or down?
http://www.metafilter.com/150184/The%2Dtoilet%2Dseat%2Dup%2Dor%2Ddown
"I amused myself for over a year thinking about the impacts of different toilet seat administration policies and how to measure them – doing calculations in my head, considering ratios of Standing events to Sitting events, and I slowly began to understand some of the specific differences in the basic policies that know to be administered most often. Finally, I decided to perform a probabilistic analysis". <a href="http://everything2.com/user/DieuEtMonDroit/writeups/Essential+Toilet+Seat+Analytics">Essential Toilet Seat Analytics</a>. tag:metafilter.com,2015:site.150184Thu, 04 Jun 2015 06:02:28 -0800paleyellowwithorangeBut is it fools' gold?
http://www.metafilter.com/149937/But%2Dis%2Dit%2Dfools%2Dgold
<a href="http://en.wikipedia.org/wiki/Golden_ratio">The Golden Ratio</a> or the Golden Mean is touted as universal principle of mathematics, aesthetics, and architecture. <a href="http://io9.com/5985588/15-uncanny-examples-of-the-golden-ratio-in-nature">Its natural occurrences</a> are often associated with beauty and health. But naysayers think the Golden Ratio is <a href="http://www.fastcodesign.com/3044877/the-golden-ratio-designs-biggest-myth">myth or even a scam</a>. Golden ratio <a href="http://www.metafilter.com/97143/Schrdingers-Ratio">previously</a> and <a href="http://www.metafilter.com/69850/golden-ratio-in-the-amen-break">previouslier</a>. tag:metafilter.com,2015:site.149937Tue, 26 May 2015 13:56:41 -0800immlassThe roads ahead are long and winding...
http://www.metafilter.com/149311/The%2Droads%2Dahead%2Dare%2Dlong%2Dand%2Dwinding
<a href="http://www.theincrediblecompany.com/try-alcazar" title="In-browser, playable version">Alcazar is a neat little path-finding logic game.</a> There are also <a href="http://www.theincrediblecompany.com/alcazar-1/" title="pencil and paper is best">printable puzzles, strategy tips and metapuzzles</a> to be had. The author has a two-part post (<a href="http://edderiofer.blogspot.com/2014/11/on-subject-of-parity-when-we-refer-to.html">Part 1</a>,<a href="http://edderiofer.blogspot.com/2014/11/parity-in-alcazar-and-other-such-loop.html"> Part 2</a>) on the use of parity in the puzzle, and another author writes briefly about <a href="http://ravensoft.tumblr.com/post/105861925602/alcazar-is-an-amazing-puzzle-game-that-can-teach">programming and problem-solving skills.</a> tag:metafilter.com,2015:site.149311Sat, 02 May 2015 05:07:38 -0800WolfdogWhen Is Cheryl's Birthday?
http://www.metafilter.com/148823/When%2DIs%2DCheryls%2DBirthday
<a href="http://www.nytimes.com/2015/04/15/science/a-math-problem-from-singapore-goes-viral-when-is-cheryls-birthday.html">How would you fare in a room full of adolescent math competitors in Singapore?</a> <a href="http://www.nytimes.com/2015/04/15/science/answer-to-the-singapore-math-problem-cheryl-birthday.html">(Answer and Explanation)</a> tag:metafilter.com,2015:site.148823Tue, 14 Apr 2015 10:32:26 -0800roomthreeseventeenAt FedEx, we considered that problem for about three seconds
http://www.metafilter.com/148403/At%2DFedEx%2Dwe%2Dconsidered%2Dthat%2Dproblem%2Dfor%2Dabout%2Dthree%2Dseconds
<a href="http://arxiv.org/abs/1410.6723">The FedEx Problem</a>: In which the author uses Euclidean geometry to determine, based on the US Population, the idea location for FedEx's giant hub in Memphis (spoiler: It's about 315 miles off).
Then, <a href="https://news.ycombinator.com/item?id=9281466"> the guy who wrote the original scheduling software for FedEx shows up at Hacker News with the real story</a>, and some war stories about the founding of FedEx: <blockquote>
You mean the time FedEx towed one of its airplanes to the other side of a hanger to keep it out of sight of a sheriff with a lock and a chain sent to lock down the airplane as collateral for unpaid fuel bills?
You mean the time two barrels of liquids in the shop got confused and maybe some bad stuff got pumped by mistake into the hydraulic systems of some unknown number of airplanes?
The time Fred, in the Dassault DA-20 Fanjet Falcon he saved as the company executive jet, was flying, kept finding airports closed, kept flying, and finally landed but flamed out from no fuel on the runway?
</blockquote> tag:metafilter.com,2015:site.148403Sat, 28 Mar 2015 19:45:06 -0800joshwaI got cosines / on a cloudy day
http://www.metafilter.com/147940/I%2Dgot%2Dcosines%2Don%2Da%2Dcloudy%2Dday
The goofy, lofi math music of Al G. Bra and friends: <a href="https://www.youtube.com/watch?v=yCe1G0LuHKs">Pi Girl</a> — <a href="https://www.youtube.com/watch?v=Qs464DqnPTo">Say That Funky Number, Math Guy</a> — Mathonna's <a href="https://www.youtube.com/watch?v=pS8b2ZHz4yw">Mathematical Girl</a>. Plus: a trailer for math thriller <a href="https://www.youtube.com/watch?v=qRiaSzfSBsU">Live and Let Pi</a>, featuring the title track by Paul DesCartney. tag:metafilter.com,2015:site.147940Sat, 14 Mar 2015 11:50:26 -0800cortexCelebrate Vi day.
http://www.metafilter.com/147933/Celebrate%2DVi%2Dday
<a href="https://www.youtube.com/watch?v=2E9m6yDEIj8">Vi Hart rants about what day today is.</a> <a href="http://www.metafilter.com/59428/Heres-a-slice-of-pi">(previous</a> <a href="http://www.metafilter.com/24292/Happy-Pi-Day">celebrations)</a> tag:metafilter.com,2015:site.147933Sat, 14 Mar 2015 06:53:20 -0800Obscure Reference"You blew it, and you blew it big!"
http://www.metafilter.com/147228/You%2Dblew%2Dit%2Dand%2Dyou%2Dblew%2Dit%2Dbig
<a href="http://priceonomics.com/the-time-everyone-corrected-the-worlds-smartest/">The Time Everyone "Corrected" the World's Smartest Woman</a> tag:metafilter.com,2015:site.147228Fri, 20 Feb 2015 18:05:13 -0800brundlefly