| Space_Web Contains many photographs of space, from Hubble and other telescopes. |
| SpaceFinder Color enhanced photographs of the solar system. |
| SPIF Spacecraft Planetary Imaging Facility. A list of planetary images. |
| Star_Formation_Pillars_in_M16 Features wallpaper of Eagle Nebula photograph taken by the Hubble telescope. |
| The_STScI_Digitized_Sky_Survey A search tool. If you know the co-ordinates or the name of an object, this search will find the image for you. |
| STScI/HST_Pictures Hubble Space Telescope Public Pictures |
| Sun_Images from SOHO, the Solar and Heliospheric Observatory. |
| Sunspots__Introduction_1_of_1 History and images of sunspots. |
| Tim\'s_Astro_CCD_Images Photos of the solar system, nebulae, galaxies, stars and clusters. |
| UA_Astronomical_Image_Galleries A large collection. |
| The_Web_Nebulae An overview of nebulae, with color images and links. |
| X-Ray_Astronomy_Gallery_-_Index ROSAT images. |
| Center_for_Tribology_-_CET Center For Tribology, Inc. is a tribology testing laboratory and a provider of tribology test instrumentation. |
| Ducom Manufacturer of standard and custom designed material testing equipment. Includes sample product list. |
| Falex_Corporation Offers a complete line of tribology test equipment and services for friction, wear, lubrication, and abrasion studies. |
| Falex_Tribology_NV A tribological testing laboratory and manufacturer of tribological test machines and specimens for sale |
| Imperial_Scientific_Industries Imperial offers tribology and petroleum test equipment as per ASTM, IP, DIN and other international standards. |
| Koehler_Instrument_Co_,_Inc_ Designs and manufactures tribology instruments for friction and wear testing conforming to ASTM, IP and related test methods as well as custom designed products. |
| National_Tribology_Services, Offers testing of gearboxes, pumps, compressors, engines, turbines, hydraulics, greases, and used lubricants, oil analysis laboratory |
| Paragon_Scientific Viscosity standards and refractive index standards. |
| Plint_and_Partners_Ltd Tribology testing division. |
| The_Aesthetics_of_Symmetry A brief digression into how people perceive symmetrical patterns -- what makes them boring, interesting, or overly intricate |
| Back_to_Square_One Includes description, solutions and other resources on this cube-like puzzle. |
| Critical_Math Articles and images on recreational math from fractals and magic squares to mathemorchids and Galois. |
| Cryptarithms_Online 70 brain-teasers; a Primer on Cryptarithmetic; books and links to alphametics on the Web. |
| David_Singmaster__List_of_Available_Material Teaching and recreational items in this personal collection. |
| The_Diamond_16_Puzzle New version of the classic puzzle using row/column/quadrant permutations to display symmetries of graphic designs. Has link to a site on the underlying mathematics (Diamond Theory). |
| A_Disproof_of_Pythagoras\'_Theorem? A method of disproving the Theorem of Pythagoras is presented. The author is adamant that this is intended only as a puzzle to find the mistake in the arguments, and not as a serious proposal. |
| The_Eugène_Strens_Recreational_Mathematics_Collection A special collection at the University of Calgary, including the archives of Martin Gardner. There is a searchable online index. |
| Eureka The annual journal of the Archimedeans, the mathematical society of the University of Cambridge. It regularly contains articles on recreational mathematics. |
| Fair_Dice Contains a complete list of all possible Fair Dice, most of which are not cubes. Includes pictures. |
| Famous_Curves Visual animations of famous curves. |
| Fast_Arithmetic_Tips Three categories: defensive - know to check an answer, offensive - fast mental calculations, and math magic. |
| Fibonacci_numbers_and_the_Pascal_triangle The relation between Fibonacci numbers and Pascal's triangle. English/German/Serbian. |
| Final_Answers Numerous facts including formulas, magic tricks, fallacies, recreations compiled by Dr. Gerald P. Michon. |
| Fun_With_Mathematics Includes pages on the topics of primes, fibonacci numbers, PI computation, data encryption and links to calculator programs. |
| Gardner_Index Rough index to the fifteen books containing Martin Gardner's Mathematical Games articles from Scientific American. |
| Geometric_Packing_Problems By Joseph Malkevitch: "Given one shape X how and when can one pack identical copies of this shape into another shape Y?" |
| HAKMEM A collection of problems from MIT. Work reported herein was conducted at the Artificial Intelligence Laboratory, a Massachusetts Institute of Technology research program. |
| Iamond A page on polyiamond puzzles. Includes many pages on tessellation. |
| Jlpe\'s_Number_Recreations_Page Features original number recreations by the author, such as generalized perfect numbers, digital diversions, diophantine equations, didactic numbers, and number theory. |
| Look_and_Say_Sequence_Generator Creates a special kind of summation formula created by John Conway. |
| MAA_Library_List_in_Recreational_Mathematics Book list split into categories. Includes title, author, publisher and date information about each book. |
| MAT_007_I_News A newsletter edited by undergraduates of the Department of Mathematics at the University of Toronto. Includes some online copies. |
| Math_Forum__2001_Mathematics_Game A contest that asks to write all integers from 1 to 100 using only the digits 2,0,0,1 and arithmetic operations. |
| Math_Forum__2002_Mathematics_Game A contest where the contestants have to write all integers from 1 to 100 using only the digits 2,0,0,2 and arithmetic operations. |
| Math_in_the_Movies A guide to major motion pictures with scenes of real mathematics. |
| Math_Magic_By_Computer Interactive java puzzles and activities in different mathematical topics. |
| Mathematical_Diversions Mostly original diversions in mathematics and word play. |
| Mathematical_Fiction A list of mathematical fictional movies, books, stories, plays and shows. Split into categories including children's books. Can be sorted by mathematical content and literary quality. |
| Mathematical_Induction A page of uncommon problems, most closely connected with number theory. |
| Mathematical_Lego_Sculptures Designed and built by Andrew Lipson. Images and LDraw files. |
| Mathematical_Problems_-_Problem_Solving Mathematics Hots (Problems) by Bruno Kevius |
| Mathematical_Quotation_Server Furman University Mathematical Quotation Server - random or searchable math quotes. |
| Mathematical_Quotation_Server A collection of mathematical quotations culled from many sources. You may conduct a keyword search through the quotation database. |
| Mathematical_Spectrum Mathematical Spectrum is a magazine for students and teachers of mathematics in universities, colleges and schools worldwide. It may be read by anybody interested in mathematics as a recreation. |
| A__Mathematician\'s_Aesthetics In his classic A Mathematician's Apology, G. H. Hardy likened mathematics to poetry and painting. This site elaborates on Hardy's remark with quotations from Stevens, Klee, Fry, and Focillon. Links to |
| Mathematics_in_Art_and_Architecture An interdisciplinary course on mathematics in art and architecture. |
| Mathematics_Museum_(Japan) At Mathematics Museum (Japan) you would be surprised how interesting mathematics is. You will find exhibition rooms produced by Japanese researchers and educators. |
| Mathematik Individual pages on different topics in Mathematics. Examples : group theory, dynamical systems theory, geometry or number theory. |
| Mathematische_Basteleien Topics include Flexagon, Soma Cube, Pentominos, Cube-it, Rubik's Cube, Froebel's Star, Tangram, House of Santa Claus, Chronogram, Numeric Palindromes, Latticework of Letters. English/German. |
| Mathematrix Devoted to exploring the more entertaining (and generally lesser known) areas of mathematics. Can be enjoyed by anyone, from individuals with little or no math background to professors of the subject. |
| Mathmos Includes puzzles, jokes, quotations, poetry, and FAQs. |
| Maze_Classification_and_Algorithms A short description of mazes and how to create them. Definition of different mazetypes and their algorithms. |
| Mudd_Math_Fun_Facts An archive of interesting math facts for use in the classroom or just for fun. Browse by subject, difficulty, keywords, or try the "random" feature. Based at Harvey Mudd College. |
| Narcissistic_Numbers Those that are representable, in some way, by mathematically manipulating the digits of the numbers themselves. |
