Whether you want to learn to lace shoes, tie shoelaces, stop shoelaces from coming undone, calculate shoelace lengths or even repair aglets, Ian's Shoelace Site has the answer!
posted on Jun 27, 2008 - View this thread

Inside Out A topographical bedtime story. (Warning, contains spheres!)
posted on Aug 28, 2007 - View this thread

Can you cut a hole in a 3x5 card that's large enough to crawl through? Topological trickery and some other classic science experiments.
posted on Jul 2, 2007 - View this thread

Dr. Jeannine Mosely finishes building a level-3 Menger sponge from business cards. You can also build your own, though Dr. Mosely warns, "[a] level 4 sponge would require almost a million cards and weigh over a ton. I do not believe it could support its own weight — so a level 3 is the biggest sponge we can hope to build." (related)
posted on Feb 2, 2007 - View this thread

Grigory Perelman, awarded the Fields Medal for his work on the Poincare Conjecture, talks to the New Yorker.
posted on Aug 29, 2006 - View this thread

Bending a soccer ball - mathematically. Found via Ivars Peterson's short exposition on Braungardt and Kotschick's The Classification of Football Patterns [pdf, technical].
posted on Aug 17, 2006 - View this thread

Grisha Perelman, where are you? Perelman has quite possibly solved one of mathematics biggest mysteries, Poincaré’s conjecture, but has since disappeared.
posted on Aug 15, 2006 - View this thread

Pretty and pretty interesting: unrooted haplotype networks -- diagrams showing the relation and mutational distance between different sets of DNA, with haplotypes represented by circles proportional to haplotype frequency, joined by lines proportional to mutational difference between haplotypes -- in cichlid fish (on page 3 ) [pdf], in stone loach fish ( on page 3) [pdf], in lesser prairie chickens (on page 6) [pdf] and in a ring species! (on page 2) [pdf]
posted on Mar 25, 2005 - View this thread

Beautiful Mathematical Surfaces : "Conceptual Forms," a series of photographs by Hiroshi Sugimoto, conceived as an hommage to Marcel Duchamp (English summary) and as an un-Man Ray-like treatment of the subject, consisting of (English summary) "Mathematical Forms" ("Curves" and "Surfaces") and Mechanical Forms.
posted on Dec 12, 2004 - View this thread

The Shapes of Space [note : pdf, sciam, poincaré conjecture]
posted on Aug 1, 2004 - View this thread

After getting the inside story (ha?) on the inventor of everyone's favorite non-orientable surface, the Klein Bottle; and perhaps playing a few games inside of one, you can check out a few 3-dimensional immersions of klein bottles: in Lego, knitted fabric, paper, or glass.
posted on Oct 30, 2000 - View this thread