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 ...

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.

"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 ...

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 ...

The chessboard has been the source of many ingenious puzzles that involve spatial reasoning and insight thinking. The seven ...

Security pros tackle tough problems every day, from breach investigations to niche technical issues to strategy and policy development. The key to maintaining and improving these critical ...

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 ...

After a week of hearing from readers, I am hopeful that our crossword puzzle problem has a solution. Last week, I wrote about the changes readers had noticed in The Daily Commuter crossword puzzle, ...

Jaye Hernandez is a well-seasoned reality TV features writer for Collider. After studying journalism and psychology, she began her career as a freelance writer. In the last 10 years, she's expanded ...

For nearly a century, some of the strangest questions in physics have revolved around how quantum objects move, interact and ...