Add Yahoo as a preferred source to see more of our stories on Google. Sorry, it’s math time. But these are some of the easiest math quizzes we’ve ever put on ...

An apparently easy-looking math problem has left internet users scratching their heads. The elementary-grade problem looks simple enough to solve in seconds, but has tripped up the masses. The basic ...

A brain teaser challenge is a type of IQ test that mostly involves solving a puzzle, cracking a code, finding a hidden object or mistake, or detecting the fault in the image. Brain teaser puzzles test ...

Artificial intelligence has attained an impressive series of feats—solving problems from the International Math Olympiad, ...

Riddles are brain teaser puzzles in the form of questions, sentences, or statements. Riddles are great brain exercises, as they get the brain to think quickly, which helps in boosting the ...