 Impossible World  Vlad Alexeev
About impossible figures in art. These figures can be painted on paper but cannot be represented in space. There are many artworks by M.C. Escher, Jos de Mey, Sandro del Prete and many other artists. Also, you can view animations and read articles about
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 Infinite Series  Public Broadcasting Service
Math videos that mix graphics with narration from mathematician Kelsey HoustonEdwards. Clips, which date back to November, 2016 and run seven to seventeen minutes in length, have included "Singularities Explained," "The Mathematics of Quantum Computers,"
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 Information is Beautiful  David McCandless
Compelling graphic presentations on health supplements, plane accidents by final destination, government spending, time travel in popular film and TV, and many other "facts, data, ideas, subjects, issues, statistics, and questions"  all with the minimum
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 Innumeracy
"Gathering examples of innumeracy" taken from the real world. Comment on existing images and anecdotes, or submit your own example. Posts, which date back to a January, 2016, conversation from the Math Educators Stack Exchange, have included "Falling
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 Interactive Math  Christopher Henrich
Topics in recreational mathematics, including polyhedra, kaleidoscopes, magic squares, and trochoids, presented with interactive applets.
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 International Slide Rule Museum  Mike Konshak
Scans and pictures of over 1000 unique actual slide rules. Search the gallery, or browse it by manufacturer. Also, learn how to use a slide rule, and determine its date. With terms, encyclopedia, manuals, a graphical table of slide rule scales, and more.
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 International Snow Sculpture Championships: Team Minnesota  Department of Mathematics and Computer Science, Macalester College
Team Minnesota's Enneper surface entry earned second place in the Breckenridge International Snow Sculpture Championships of 2000. The site also includes photos of their planning, design, and implementation stages, the acceptance speech, and the team's
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 International String Figure Association (ISFA)
The ISFA site introduces "String figures" (designs formed from nothing more than a loop of string), with instructions on how to become a member of ISFA and information on email discussion groups and international gatherings, and links to related sites.
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 Internet Problem Solving Contest  Faculty of Mathematics, Physics and Informatics, Comenius University, Slovak Republic
The Internet Problem Solving Contest (IPSC) is a computer programming contest for teams consisting of up to three people. Teams participate via the Internet. Each problem consists of a problem description and two input data sets. Questions tend towards
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 The Intrepid Mathematician  Anthony Bonato
Blog by a professor at Ryerson University (Toronto) "about mathematics in popular culture and my own journey as an academic, thinker, and writer." Posts, which date back to early 2015 and address nonmathematicians, have included "Caitlyn Jenner and the
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 Intriguing Tessellations  Marjorie Rice
Famous for discovering four hitherto unknown tilings of pentagons, Marjorie Rice got her start in tessellations reading an article by Martin Gardner. This site features mathematical explanations and examples of several tessellations using pentagons, as
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 Isabel's Math Blog  Isabel Catherine Lugo
A log of "interesting mathematicsrelated things" found on the web. The author studies mathematics at MIT, and since April of 2004 has used the blog to "... talk about interesting mathematics I come up with myself  mostly toy problems, but I might even
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 Japanese Temari  Barb Seuss
Read about the history of this Asian needlework craft, find free patterns to stitch your own geometric designs on the sphere, browse online galleries of temari, and more.
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 Java Jive  Martin J. Chlond
A Game of NIM, Games Coins Play (NIMlike coin games), Kayles (remove coins), SpaceTime Maze (a 4D maze puzzle), Northcott's Game (played on a chessboard), Corner the Queen, CGT Chess (played on a 6by8 checkerboard), and 5 X 5 and Lights on (each
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 Journal of Recreational Mathematics  Joseph S. Madachy, Editor Emeritus
A journal devoted to the lighter side of mathematics, featuring games, puzzles, and articles that challenge the mental agility of everyone who enjoys the intricacies of mathematics. Edited by Charles Ashbacher and Lamarr Widmer.
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 Justin Mullins
High resolution photography of famous math formulas, available for purchase as posters and limited edition prints.
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 K12 Math Problems, Puzzles, Tips & Tricks  Math Forum
Links to calculation tips (Beat the Calculator, Divisibility Rules, Multiplication Tips), Math Problem sets, and math number and line puzzles.
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 Kakuro Puzzles  JAKRO Soft LLC
Free printable crossword puzzles that use sums instead of spellings, offered at difficulty levels of easy, medium, hard, and "evil." See also JAKRO's apps and page of tips for solving kakuro.
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 KenKen  Nextoy, LLC
KenKen is a sudoku variant invented by Japanese mathematics teacher Tetsuya Miyamoto. This site offers puzzles at various levels of difficulty to get you started, as well as rules, tips, news, related products, KenKen programs for your mobile device,
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 KenKen @ the Math Forum  Nextoy, LLC and the Math Forum @ Drexel
A collection of KenKen puzzles ranging in size from 3x3 to 9x9, at four difficulty levels, with many combinations of arithmetic operations. The site offers an introduction to KenKen, lesson plans, rules, discussion, and tutorial. KenKen is a number puzzle
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 Kids Math Games Online  Rene Smith
Free interactive games on addition, counting, division, geometry, money, multiplication, number (including mean median mode), problem solving (bridge crossing, hourglass time, wolf and sheep), and subtraction. Logic games include a 3D puzzle cube, Mastermind,
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 The King of Infinite Space: Donald Coxeter, The Man Who Saved Geometry  Siobhan Roberts
As a companion to The King of Infinite Space, a biography of Donald Coxeter, this website provides photographs, archives, papers, video footage, links and other resources, allowing readers to further explore Donald Coxeter’s infinite passion for geometry.
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 The Knight's Tour  Dan Thomasson
The Knight's Tour web site shows various ways to solve open and closed knight tours. The site also offers several animated tours, artwork, and new concepts (magic squares, tessellations, and conjectures about prime numbers) derived from knight moves on
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 KrazyDad.com  Jim Bumgardner
Printable puzzles, mazes, games, and more from a selfdescribed "senior nerd" at Disney Interactive Labs: kakuro (aka cross sums, numeric crossword puzzles), krypto kakuro (a combination of kakuro and cryptograms), slitherlink, bridges (aka Hashiwokakero),
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 Let's Play Math!  Denise Gaskins
"As a homeschool mom who loves math, I want to help other homeschoolers see the variety and richness of the subject.... I hope this blog will be a place where we can play around with ideas about learning, teaching, and understanding math. (For me, it
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 Lewis Carroll  Jerry Stratton
"Lewis Carroll's work is often disneyfied for children, but when read raw is complex and fascinating...." Full texts and illustrations by Carroll, aka Charles Lutwidge Dodgson: Alice's Adventures Everywhere, Alice's Adventures Underground, Alice's Adventures
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 LiveCube.com  Min Shih
A puzzlebuilding system: small colored cubes may be joined to create larger assemblies. Site includes puzzle models, discussion areas for puzzle designers and educators, and a catalog of puzzle components for purchase. Requires several plugins; files
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 LiveSudoku  LiveSudoku.com
Play Sudoku free online at four different levels: beginners, medium, hard, and "wicked." The JavaScript game's options include pencil markings, highlighting, and solution checking. LiveSudoku.com also offers tutorials, tracks player performances on current
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 Liz's Research Interests  Liz Bradley, Department of Computer Science, University of Colorado
Artificial intelligence projects include Chaography, a pair of tools that use mathematics to generate choreographic variations: Chaographer, which uses a chaotic mapping to generate variations on a musical piece; and MotionMind, which uses machine learning
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 LotteryTrends.com  Abe Acosta
Frequency tables of winning lottery numbers, patterns of consecutive winning numbers, winning lottery number sums, and more decades of data from dozens of powerballs, lottos, megabucks, pick 6s, and other gamblings.
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 Magic Cube 4D  Melinda Green, Don Hatch, and E. Jay Berkenbilt
MagicCube4D is a fourdimensional Rubik's cube  an exact analogy in four dimensions to the original plastic three dimensional puzzle. Download the Java applet or pacakges for UNIX, Linux, or C++ source code.
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 Magic Cube Generator  Dwane H. Campbell, Keith A. Campbell
This site offers a generator for magic squares, cubes, and hypercubes, along with history, overview of basic concepts, and statistics, and downloads and references. The authors focus primarily on a set of 8 by 8 by 8 magic cubes that are often called
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 Magic Squares, Magic Stars & Other Patterns  Harvey Heinz
A large collection of material on magic squares, cubes, hypercubes, stars, and other 'magic' objects. Also pages on other number patterns. The purpose of this site is to show that mathematics can be fun. Subjects demonstrated include algebra, patterns,
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 Marius Kempe
Kempe's activities consist of photos of a manipulative or geometric drawing, each captioned with brief instructions and a question. "Writing" includes a guide to the errata for Weyl's Symmetry; as well as translations of Pólya's "On the analog
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 MASSIVE: Math And Science Song Information, Viewable Everywhere  Greg Crowther
A searchable database of over 1800 educational songs, including many about math. Part of the National Science Foundation's National Science Digital Library (NSDL).
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 Matematicas recreativas, Juegos, Logica, Ingenio, Matemáticos, Magia  Eduardo Ochoa
In Spanish, recreational mathematics puzzles: Matemáticas Recreativas, Juegos, Lógica, Ingenio, Matematicos, Cuentos, Acertijos, Magia.
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 MathArt.net
A web gallery of mathematical art, including a blog. MathArt.net features artworks, artists, and interviews. It covers many forms of mathematics, as long as there are artistic imagery involved (this means the usual Chaos Theory, geometry and the like).
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 Mathbun  Chaim GoodmanStrauss
Mathematical graphics, featuring many fractals and tessellations. The category of mathematical objects includes photographs of jigsaw puzzles and outdoor sculpture; "math fun," of Zome and tilings.
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 Math Craft  Cory Poole, administrator
A community "dedicated to the exploration of mathematically inspired art and architecture through projects, community submissions, and inspirational posts." Share images, videos, and other resources on the corkboard; post questions to the forum. The blog
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 Math Day  University of NebraskaLincoln
An annual "day of fastpaced mathematics" for high school students hosted by the University of NebraskaLincoln's Department of Mathematics since 1990. See multiplechoice and essay problems from the individual competition, named PROBE ("Problems Requiring
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 Mathematical/Abstract Games in Portuguese  Jorge Nuno Silva
A site devoted to mathematical games: find information about the games and their strategies, exchange them online, compete in contests such as the Campeonato Nacional de Jogos Matemáticos (CNJM), participate in discussion forums, and more. Games
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 Mathematical Etudes  Mathematical Etudes Foundation
Explorations of mathematical curiosities, some as yet unexplained, through computer animations: train wheels; the sandwich problem; Lipkin linkage; a clever folding; shield a ray; the net of a polyhedron; the vernier scale; the Pythagorean theorem; angle
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 Mathematical Fiction  Alex Kasman
Want a book or story for the students in your math class? Interested in what our society thinks about mathematicians? This site is dedicated to compiling and reviewing works of fiction that involve mathematics or mathematicians. Search the list of math
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 Mathematical Maelstrom  Chris Bolton, Pluto Puzzles
Crossnumber puzzles that test the solver's mathematical and logical powers.
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 Mathematical Paintings of Crockett Johnson  David Crockett Johnson; Smithsonian National Museum of American History
David Crockett Johnson was perhaps most famous for his children's book Harold and the Purple Crayon. From 1965 until his death in 1975, Crockett Johnson painted over 100 works relating to mathematics and mathematical physics. Of these paintings, eighty
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 Mathematical Palette  Guillermo Bautista
A blog that "highlights the lighter side of mathematics.... photos, paintings, songs, poems, jokes, animations, graphics, games, and puzzles and the mathematics within and about them." Posts, which date back to February, 2012, have celebrated "mathematical
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 The Mathematicians
A gift shop selling tshirts, sweatshirts, note cards, desk clocks, poster portraits, and greeting cards based on a visual portrait history of famous mathematicians that incorporates their key concepts. Based on a limited edition "The Mathematicians"
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 The Mathematician's Shirt  Collins, Julia; and Shepherd, Madeleine
A collaboration between mathematician Julia Collins and artist Madeleine Shepherd to "design and create a series of sculptures made out of shirts and representing different concepts in mathematics." With funding by the Art Science Collaborative (ASCUS),
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 Mathematics in Tens  Steve Mayer
Ten ... problems to make you think, facts about maths you may not know, good maths books, mathematicians, maths jokes, reasons to study maths, mathematical links, mathematics software programs, mathematical constants, mathematical formulae. Ten littleknown
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 matheminutes  Owen Elton
Blog of "important aspects of mathematics in bitesize chunks" by a maths teacher in Surrey, England. Posts, which date back to August, 2011, have included "Competitive Colouring"; "The Geometry of Sushi"; "Mathematicians on Money"; "Nontrivial Trivial
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