CONSEF 2017

Two very interesting mathematics demonstration: Stick Stool that can hold up to 5 pounds! and Spinni

What is the shortest road that can be constructed to connect four houses at the corners of a square

Matchstick puzzles are puzzles in which you arrange a set of matchsticks in a pattern or shape and a

Oval jigs are designed to cut partial or full ovals quickly and with precision. Whether you're cutti

The number of possible chess positions after White’s first ply move is 20 (16 pawn moves and 4 knigh

The Soma cube consist of seven different polycubes, the threedimensional analogues of polyominoes. T

The board consists of a grid with twenty-four intersections or points. Each player has nine pieces,

Geometrical-optical illusions are visual illusions, also optical illusions, in which the geometrical

A puzzle in which 63 squares, divided into 10 separate tiles, are arranged and rearranged so that th