geometry How Eratosthenes calculated the circumference of the Earth in 200 BC Mark Frauenfelder

videos The baffling topology of the burrito method for covering your duvet Cory Doctorow

math Fix your floppy pizza slice with Gaussian curvature Andrea James

Internet Site finds the "visual center" of your images Rob Beschizza

Boing Boing Gadgets What's the best way to distribute numbers on the faces of a D120? Cory Doctorow

art How to draw Islamic geometric patterns Mark Frauenfelder

animation Watch this elegant dance of triangles by animator René Jodoin (1966) David Pescovitz

offworld The geometric horror game Euclidean is Lovecraft levels of scary Laura Hudson

math The geometry of fireworks Xeni Jardin