Calculation of π, from rain falling on two wooden plate sensors, one circular and one square: the number of raindrops that landed on each plate during a storm was counted with an Arduino and π was calculated as the ratio [source & credits:]

Q: Why can't you use 'Beefstew' as a password? A: Because it's not strogonoff.

The European Women in Maths released a poster featuring Notable Women of Mathematics and short biographies.

It is free to download and print in Dutch and English (for now, more translations are ongoing as far as I know), it would be great to display it on the walls our mathematics departments:

Testing testing. Seeing how well animations work here on Mastodon.

Approximation to a fundamental domain for the Cannon-Thurston map for the figure eight knot complement, joint work with Saul Schleimer.

Thanks to everyone who's written something on so far.

I'm gathering ideas and some questions about how the site should be organised, at

Please add your opinions!

I wanted internet money, not a speculative financial instrument.

Working on a dodecahedral holonomy maze design. This will be much harder, with 120 nodes in the maze (up from 24 in the original octahedral version).

New entry!
Gödel for Goldilocks: A Rigorous, Streamlined Proof of (a variant of) Gödel's First Incompleteness Theorem
Article by Dan Gusfield
In collection: About proof
Most discussions of G\"odel's theorems fall into one of two types: either they emphasize perceived philosophical, cultural "meanings" of the theorems, and perhaps sketch some of the ideas of the proofs, usually relating G\"odel's proofs...
Entry: read.somethingorotherwhatever.

Japan really has mastered being passive aggressive

"Kobe neighborhood occasionally held hostage by owner of only bridge out"

Basically, the developers didn't transfer ownership to the town and it passed hands over the years to one guy (which wasn't supposed to happen). The bridge isn't in good shape and he wants the town or the people to buy it for 12 million yen

Anyone want $2 million?

All you gotta do is catch #Bigfoot, alive and unharmed, in Oklahoma

"Oklahoma's bounty on Bigfoot has grown to nearly $2.1 million only weeks after a bill was proposed to allow capturing of the mythical creature."

"The number one rule, Sasquatchers must capture Bigfoot unharmed and can’t injure anyone else or break any laws in the process."

Riemann zeta function and first two zeroes (positive), around 0.5+14i and 0.5+21i

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