Compass-and-straightedge construction (aka Euclidean construction) is a method of drawing precise geometric figures using only a compass and a straightedge (like a ruler without the markings). MathOpenRef maintains a catalog of many common constructions, each with an explanatory animation and a proof. This YouTube video demonstrates how to construct almost every polygon that can be constructed using these methods. [more inside]
The Lesser Bot of Solomon offers you endless pages from a text in the style of Ars Goetia and the Pseudomonarchia Daemonum. [more inside]
This is a game where you push circles into other circles. This is a destructively massive time sink. You have been warned.
Worried that your feline house-mates will ruin Thanksgiving with their evil kitty machinations? Fear not! Once you learn How To Trap A Cat In 3 Easy Steps, you can feel safe in the knowledge that your furry ball of mischief is safely jailed by cat psychology!
Alphabet Blocks for a Geek Baby "Amateur engineer/designer" Jonathan M. Guberman made his newborn son a set of custom engraved wooden alphabet blocks, with "things that his mother and I were looking forward to sharing with him" on 4 of the 6 sides. (See them all here) "The only real rule I followed in choosing subjects was trying to maintain an even gender balance" which makes them even more awesome. (Of course, your choices for certain letters may vary)
The New York Times magazine has published an excerpt from Dave Eggers' new book The Circle. It features a protagonist who has just begun work at one of the world's foremost tech companies, and things quickly turn slightly sinister. [more inside]
"Video footage of the little artist at work recently surfaced. It was uploaded to YouTube by MarineStation Amami, a hotel and dive center that assisted Yoji Okata and NHK in producing the video segment that aired last year. Of note, watch at around 1:20 when the fish takes a small shell in his mouth and plants it in the sculpture. Scientists believe that the shells are filled with vital nutrients and this is the soon-to-be-father’s way of preparing nourishment for the babies." UPDATE [Aug 26, 2013] [more inside]
I ♥ Cardioids, Vi Hart's condensed awesome tackles parabolas, cardioids, circles and more. Related: Part 1 of Rolling Circles and Balls.
Bryan Hollon, better known by his musical handle Boom Bip, is probably recognized for two drastically different sounds: abstract hip-hop from his early Mush Records days, and his Mercury Prize-nominated Neon Neon collaboration with Gruff Rhys. Add to that a new inspiration: black magic from the turn of the 19th century. What does that sound like? Let Boom Bip walk you through his new album, Zig Zaj. Step behind the deep red velvet curtains for a peek at the history of Boom Bip. [more inside]
The best known packings of equal circles within a circle. Best packings with 1-12 circles. Best packings with 49-60 circles. Best packings with 1093-1104 circles. Also, circles whose areas form a harmonic series. Circles in an isosceles right triangle. Or generate your own circle packings. (Background for beginners: circle packing. Background for experts: circle packing.)