If there are nine people in a room and every person shakes hands exactly once with each of the other people, how many handshakes will there be? How can you prove your answer is correct using a model ...

The Rubik’s Cube has been around for decades. I’ve toyed with the cube, probably in the very late ‘80s or early ‘90s, but never imagined being able to solve one. But wouldn’t it be satisfying if I ...

The first time I was allowed to travel beyond the Iron Curtain and visit the West was in 1980. I ventured from Hungary to New York for the International Toy Fair, where a puzzle I had invented was ...

For decades, a math puzzle has stumped the smartest mathematicians in the world. x 3 +y 3 +z 3 =k, with k being all the numbers from one to 100, is a Diophantine equation that's sometimes known as ...

Problem-solving is an essential life skill that involves identifying, analyzing, and resolving challenges effectively. Have you ever found yourself staring at a problem, feeling like you’re trying to ...

This video is no longer available. Sai Charan Kintali carries so many puzzle cubes with him during the day at Irving Middle School in Springfield, Virginia, he keeps them in a special black case in ...