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enPlaying with numbers
https://plus.maths.org/content/playing-number
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<p>Here's a game: pick a positive natural number and if yours is the smallest number no one else has picked, you win. What's the best strategy?</p>
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<p>We recently challenged our Twitter followers to a game: pick a positive natural number and if yours is the smallest number no one else has picked, you win. We are now pleased to announce that we've found a winner (who has been informed) and that the winning number is 6. Below is a histogram counting how many times the numbers up to 200 have been picked. There were a total of 127 responses, but for clarity the histogram misses out the 17 responses that were over 200 (142857 was the largest).</p><p><a href="https://plus.maths.org/content/playing-number" target="_blank">read more</a></p>https://plus.maths.org/content/playing-number#commentsFP-top-storystrategyTue, 24 Nov 2015 09:51:52 +0000mf3446470 at https://plus.maths.org/contentA new particle for Christmas?
https://plus.maths.org/content/new-particle-christmas
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<img class="imagefield imagefield-field_abs_img" width="100" height="100" alt="" src="https://plus.maths.org/content/sites/plus.maths.org/files/abstractpics/5/19_nov_2015_-_1657/lhc_icon1.png?1447952271" /> </div>
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<p>A bump in the data from the LHC promises exciting news.</p>
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<p>Remember the huge excitement surrounding the <a href="https://plus.maths.org/content/higgs">discovery of the Higgs
boson back in 2012</a>? At the time scientists at the Large Hadron
Collider (LHC) in CERN didn't catch sight of the fabled particle itself,
rather they inferred its existence from a bump in the statistical data
their experiments produced. Now a similar bump
is again causing some excitement. While the Higgs boson
had already been predicted back in the 1960s, nobody knows exactly what kind of
particle hides behind the current bump.<p><a href="https://plus.maths.org/content/new-particle-christmas" target="_blank">read more</a></p>https://plus.maths.org/content/new-particle-christmas#commentsCERNelementary particleFP-top-storyhiggs bosonLHCparticle physicsUniversity of CambridgeFri, 20 Nov 2015 14:17:21 +0000mf3446469 at https://plus.maths.org/contentThe secret club of diverse triangles
https://plus.maths.org/content/secret-club-diverse-triangles-0
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Fabrizio Calimera and Giulio Codogni </div>
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<p>Using theatre to teach primary school maths.</p>
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<p>This is the story of a workshop of physical theatre and mathematics, held in a primary school in Rome. Why did we mix up physical theatre and mathematics? To start with, let us stress that by physical theatre we do not mean the preparation of a play, but all those physical activities an actor might use
— forming something like an actor's "gym". We proposed a small selection of easy exercises, and the result was great!</p><p><a href="https://plus.maths.org/content/secret-club-diverse-triangles-0" target="_blank">read more</a></p>https://plus.maths.org/content/secret-club-diverse-triangles-0#commentsFP-belowmathematics educationWed, 18 Nov 2015 14:33:50 +0000mf3446461 at https://plus.maths.org/contentMiddle class problems
https://plus.maths.org/content/middle-class-problems
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<p>A famous question involving networks appears to have come closer to an answer.</p>
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<div style="float: right;"><table><tr><td><div class="rightimage" style="width: 300px;"><img src="/sites/plus.maths.org/files/news/2015/graphiso/map3.png" alt="Accurate London Underground map" width="300" height="254" />
<p></p><p><a href="https://plus.maths.org/content/middle-class-problems" target="_blank">read more</a></p>https://plus.maths.org/content/middle-class-problems#commentscomplexityFP-top-storygraphgraph theorynetworkP vs NPTue, 17 Nov 2015 10:22:30 +0000mf3446468 at https://plus.maths.org/contentCelebrating general relativity
https://plus.maths.org/content/celebrating-general-relativity
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<p>A hundred years ago, on 25 November 1915, Einstein first presented his general theory of relativity. We explore this famous theory and what it says about the world we live in.</p>
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<div style="float: left; max-width: 550px;"><p>A hundred years ago, on 25 November 1915, Einstein
presented his general theory of relativity to the world. But what exactly is this famous theory and what does it say about the world we live in? To celebrate the centenary of general relativity we bring you a collection of articles, videos and podcasts exploring the theory, Einstein's struggle to find it, and some interesting consequences.</p><p><a href="https://plus.maths.org/content/celebrating-general-relativity" target="_blank">read more</a></p>https://plus.maths.org/content/celebrating-general-relativity#commentsblack holeEinsteinFP-carouselgeneral relativitygravitational wavehistory of mathematicsrelativityMon, 16 Nov 2015 13:26:20 +0000mf3446456 at https://plus.maths.org/contentCounter logic: Solution
https://plus.maths.org/content/counter-logic-solution
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<p>Imagine that I have three counters X, Y and Z. They are coloured red, white and blue, but not necessarily in this order. One, but only one, of the following statements is true:</p>
<p>X is red</p>
<p>Y is not red</p>
<p>Z is not blue</p>
<p>Can you work out the colours of the counters?</p><div class="field field-type-number-integer field-field-hidden">
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<p><a href="https://plus.maths.org/content/counter-logic-solution" target="_blank">read more</a></p>https://plus.maths.org/content/counter-logic-solution#commentspuzzleMon, 16 Nov 2015 10:45:13 +0000mf3446453 at https://plus.maths.org/contentWhat is a black hole – mathematically?
https://plus.maths.org/content/what-black-hole-part-2
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The Plus team </div>
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<p>Pau Figueras explains how Einstein's theories predicted the existence of black holes, and how to describe them mathematically.</p>
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<p><EM>We asked cosmologist <a href="http://www.damtp.cam.ac.uk/people/p.figueras/">Pau Figueras</a> everything you've ever wanted to know about black holes. In the <a href="https://plus.maths.org/content/what-black-hole">other part of the interview</a> he explained what black holes are, physically, and how we hope to observe them. In this second part of the interview, he explains how Einstein's theories predict their existence, and how to describe them mathematically.</em></p>
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<strong>How were black holes first predicted?</strong>
</p><p><a href="https://plus.maths.org/content/what-black-hole-part-2" target="_blank">read more</a></p>https://plus.maths.org/content/what-black-hole-part-2#commentsblack holeEinsteinFP-top-storygeneral relativityUniversity of CambridgevideoFri, 13 Nov 2015 16:24:38 +0000Rachel6451 at https://plus.maths.org/contentWhat is a black hole – mathematically?
https://plus.maths.org/content/what-black-hole-mathematically
<div class="rightimage" style="width: 300px;"><img src="/sites/plus.maths.org/files/articles/2012/mtheory/blackhole.png" alt="Black hole" width="300" height="240" /><p>Simulated view of a black hole. Image: Alain Riazuelo.</p></div>
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We asked cosmologist Pau Figueras everything we’ve ever wanted to know about black holes. In this podcast he explains how you describe black holes mathematically, and how they were predicted by Einstein’s theories.
</p><p><a href='https://plus.maths.org/content/sites/plus.maths.org/files/podcast/pluspodcastnov15-blackholes2.mp3'>Listen to our interview with Pau Figueras</a></p><p><a href="https://plus.maths.org/content/what-black-hole-mathematically" target="_blank">read more</a></p>https://plus.maths.org/content/what-black-hole-mathematically#commentsblack holegeneral relativityrelativityUniversity of CambridgeFri, 13 Nov 2015 14:13:44 +0000Rachel6466 at https://plus.maths.org/contentWhat is a black hole – physically?
https://plus.maths.org/content/what-black-hole
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The Plus team </div>
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<p>Small, dark, and very hard to see. This and far more indepth answers to every question you ever wanted to ask about black holes.</p>
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<p><EM>We asked cosmologist <a href="http://www.damtp.cam.ac.uk/people/p.figueras/">Pau Figueras</a> everything you've ever wanted to know about black holes. In this, the first part of the interview, he explained what black holes are, physically, and how we hope to observe them. You can also read the <a href="https://plus.maths.org/content/what-black-hole-part-2">second part of the interview</a> where Pau explains how black holes were predicted, and how the maths of black holes makes them particularly simple to describe.</em></p>
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<strong>What is a black hole?</strong>
</p><p><a href="https://plus.maths.org/content/what-black-hole" target="_blank">read more</a></p>https://plus.maths.org/content/what-black-hole#commentsblack holeEinsteinFP-carouselgeneral relativityUniversity of CambridgevideoFri, 13 Nov 2015 14:12:11 +0000Rachel6449 at https://plus.maths.org/contentWhat is a black hole – physically?
https://plus.maths.org/content/what-black-hole-physically
<div class="rightimage" style="max-width: 350px;"><img src="https://plus.maths.org/content/sites/plus.maths.org/files/articles/2015/Tong/blackhole.jpg" alt="Curved space-time" width="350" height="222" />
<p>An artist's impression of a black hole. Image: Robert Hurt, <a href="http://www.nasa.gov">NASA</a>/<a href="http://www.jpl.nasa.gov">JPL-Caltech</a>.</p>
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We asked cosmologist Pau Figueras everything we’ve ever wanted to know about black holes. In this podcast he explains what black holes are, physically, and how we hope to observe them.
</p><p><a href='https://plus.maths.org/content/sites/plus.maths.org/files/podcast/pluspodcastnov15-blackholes1.mp3'>Listen to our interview with Pau Figueras</a></p><p><a href="https://plus.maths.org/content/what-black-hole-physically" target="_blank">read more</a></p>https://plus.maths.org/content/what-black-hole-physically#commentsblack holegeneral relativityrelativityUniversity of CambridgeFri, 13 Nov 2015 14:00:08 +0000Rachel6465 at https://plus.maths.org/content