The Mystery of the Super Bowl Match-Ups

Four teams. Four probabilities. This shouldn't be that hard... right?

Six new geometry puzzles. How many can you solve?

Catriona Shearer strikes again.

The Game of Snakes

A pencil-and-paper game for the snake-fearing (or snake-loving) mathematician.

Books I Loved in 2019

Thirty favorites (not including the one I wrote).

The Incalculable Joy of Fermi Questions

How many clicks will this post get?

366 Days of Math

The February 29th page is a flowchart for whether you need the February 29th page.

Why Does Everything Make Us Feel Old?

I mean, other than the fact that we're old.