For nearly 60 years, the “moving sofa problem,” a long-standing mathematical puzzle, remained unsolved. Last year, a Korean ...

Test your problem-solving skills with these 62 lateral thinking puzzles. They’ll challenge you to think out of the box to ...

During the blustery cold days and cozy nights this winter, there’s no better time to rediscover the simple pleasures and quiet joys of indoor activities that help you relax and reconnect with family.

This holiday-themed brainteaser looks simple, but it's quietly tripping up adults everywhere. A math teacher walks us through ...

Why are we asking for donations? Why are we asking for donations? This site is free thanks to our community of supporters. Voluntary donations from readers like you keep our news accessible for ...

Gregory Treverton, a national security expert at RAND Corporation, famously distinguished between two types of problems, puzzles and mysteries. He was describing the modern challenges faced by the ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." When 2D puzzles are no longer exciting, 3D brain teasers are the way. These handheld puzzles require ...

Almost exactly a year ago, I posed a card puzzle here that sparked a frenzy in the comments section. The solution to that puzzle was so counterintuitive that several readers rejected it outright. In ...

At the beginning of freshman year my floormates and I bought a puzzle together. It doesn’t seem like a noteworthy act of rebellion or a radical move in any sense, but for me, it was life-changing.