God Plays Dice

So I asked on Sunday the following question: pick two points on a unit sphere uniformly at random. What is the expected distance between th...

Here's a cute problem (from Robert M. Young, Excursions in Calculus , p. 244): "What is the average straight line distance between ...

How to draw Voronoi diagrams by hand . Just to remind you, a Voronoi diagram is associated with a set of points x 1 , ..., x n in the plane...

The Baker's Edge brownie pans, which are pans constructed in such a way that everybody gets an edge piece and nobody gets a piece from ...

Fix two sets X and Y in the plane, each the interior of a curve, such that their closures don't intersect. How would one go about findi...

On reddit : a link to the old chestnut that high-dimensional spheres are weird . If you consider the volume of the unit ball in R n as a ...

While reading a paper (citation omitted to protect the "guilty"), I came across a reference to an " n -dimensional tetrahedro...

The Geometry of 3-Manifolds , a lecture by Curt McMullen . This is one of the Science Center Research Lectures; in which Harvard professors...

From 360 : Shinju , a geometrical game. You're given an arrangement of shells in some of the squares of a square grid. One of the shel...

Check out the eyeballing game . You're asked to "eyeball" various geometric constructions -- the perpendicular to a given seg...

Groundskeepers Display Artistry on the Diamond , September 30 (?) New York Times. David Mellor, the current head groundskeeper at Fenway Pa...

I don't know much about golf. Basically I know the following things: you try to get the ball in the hole; scoring works by counting th...

Keith Devlin writes about The Napkin Ring Problem in his column this month. The problem is the following: consider a sphere with a cylindr...

Here's a question that occurred to me this morning -- what's the circumference (is this word appropriate here?) of an ellipse with s...

There's a pretty standard theorem that one proves at the beginning of, say, a differential geometry course -- that any (n-1)-dimensional...

That is, "all mathematics is divided into three parts". I don't actually know Latin. I fear I may have said that Mathematica...

Nineteen proofs of Euler's Formula , from The Geometry Junkyard . (This is the one that says that if V, E, and F are the number of vert...

Today's Final Jeopardy question (alas, I didn't write down the category, but it was something like "brands"): "Each u...

In Tropics widen, fringe areas drier, experts say , from the Associated Press, I found the following quote: Geographically, the tropical reg...

Imagining the tenth dimension , by Rob Braynton. The place where I originally read about this link thought it was kind of cringeworthy, but...