Four beautiful new puzzles.
And 20 more of my proudest math cartoons.
Four teams. Four probabilities. This shouldn't be that hard... right?
Catriona Shearer strikes again.
A pencil-and-paper game for the snake-fearing (or snake-loving) mathematician.
Thirty favorites (not including the one I wrote).
How many clicks will this post get?
The February 29th page is a flowchart for whether you need the February 29th page.
I mean, other than the fact that we're old.
Fight cold with math.