Detangling enthusiasts trade snarled yarn to tease back into order

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Online communities like Ravelry's "Knot a Problem" invite knitters to ship them their most tangled yarn, which they patiently unravel and wind into usable skeins, as a kind of knitting-adjacent hobby, one that combines problem solving with topology. Read the rest

Engraving a Klein bottle with an Eggbot

The Evil Mad Scientists were presented with a challenge: inscribe one of Cliff Stoll's hand-blown Klein bottles, an object of surpassing beauty and odd topology. They modified an Eggbot plotter to etch the surface of a Klein bottle with a diamond engraver attachment. Read the rest

Gravity-defying levitating superconductor on a magnetic Möbius strip

Andy from the Royal Institution made a large, suspended Möbius strip out of rare-earth magnets, then cooled down an object until it became a superconductor, and set it levitating and running around the track. The result is amazing, plus Andy's explanation is cogent and fascinating. Plus, gravity-defying levitation!

Levitating Superconductor on a Möbius strip (Thanks, Ed!) Read the rest