When you attempt a puzzle like this, your brain works on two levels: quick scanning for broad details and deep focus for ...

TOKYO -- A Japan-U.S. research team on March 10 offered a mathematical proof that "Dudeney's dissection," a challenge to cut ...

For this challenge you'll be presented with a sequence of different shapes. To solve the puzzle you will need to identify which missing shape completes the sequence. It may help to have a pencil ...

Henry Ernest Dudeney posed the famous dissection problem of transforming a triangle into a square by cutting it into as few ...