**Knot 271** 2002-11-21 | **Multimagic Squares** Un site dédié aux "carrés multimagiques." There is also an english version. Multimagic squares are magic squares which remain magic after their numbers are raised to various powers (squared, cubed, ...). |

**Knot 270** 2002-11-12 | **Byrne's edition of Euclid** This site includes digital images of an 1847 edition of Euclid (edited in 1847 by Oliver Byrne) that covers the first 6 books. Byrne's edition attempts to present Euclid's proofs in terms of pictures, using as little text as possible, but lots of colour! |

**Knot 269** 2002-10-28 | **NCTM Illuminations** Designed to "illuminate" the NCTM Standards, this site has a wonderful collection of math-lets for aimed at the grades 4-12 level, but fun for all! |

**Knot 268** 2002-10-11 | **The Evariste Galois Archive** This site contains a biography of Galois in five different languages, a mailing list, and an introduction to Galois Theory. |

**Knot 267** 2002-09-25 | **Escher and the Droste effect** This site presents a complete mathematical analysis of Maurits Escher's "The Print Shop," and also includes an image of the original print. |

**Knot 266** 2002-09-13 | **The Mathematics and Origins of String Figures** Martin Probert's site provides a discussion of the mathematics behind string figures like the cat's cradle, a history of their development and some instructions for making your own. |

**Knot 265** 2002-08-30 | **Number Theory** This site features a collection of calculators, tables and articles about number theory. It also includes an applet that is able to factor big numbers and a quadratic diophantine equation solver, among other things. |

**Knot 264** 2002-08-07 | **Computing Minimal Equal Sums Of Like Powers** As the site says: "This project is dedicated to all those who are fascinated by powers and integers." |

**Knot 263** 2002-07-31 | **Math posters in the London Underground** The Isaac Newton Institute for Mathematical Sciences presents a series of mathematical posters that were displayed in the London Undergound for World Mathematical Year 2000. |

**Knot 262** 2002-07-09 | **MathPages** A nice collection of mathematics articles categorised by field--check out the Number Theory and Geometry sections. |