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Posted on July 24, 2015

Congruent Rectangles Puzzle (trig solution)
A trigonometric solution to last weeks geometry puzzle.

Posted on April 19, 2022

Mathematician`s Card Trick
Guessing from three boxes in one try.

Posted on May 13, 2015

Poincaré conjecture
Poincaré conjecture, Topology, million dollar prize and pretty pictures.

Posted on November 30, 2020

Gender Identification Puzzle [Update]
A solution with lower expected value.