Collection

The Mathematical Radio

Sudoku Puzzle Cube

Hollow Skewb Ultimate

Gold DNA Double Helix Earrings*

Ice Ball Tray - 32 Small Spheres

Origami Paper: Circles and Squares

Simple Origami

Secret Birthday Message, The

Hand-painted Hungarian Eggs

It's a Numberful World: How Math Is Hiding Everywhere

The Spectre is a challenging puzzle with pieces that tile in a very interesting way.

"This handy guide is here to bring the internet age a much needed dose of old-school logic (really old school, a la Aristotle)!”