Brain teasers are a fun way to test one's thinking skills. These puzzles give the brain a quick workout. A recent challenge ...

Some of the most satisfying number puzzles require little mathematical know-how. In fact, cracking the one below calls for thinking that is quite nonmathematical. I don’t know where or when I first ...

From zero to the Fibonacci sequence, ancient Indian scholars like Baudhayana, Brahmagupta, and Madhava pioneered ...

Physicists are now using principles from quantum mechanics to build a new model of the abstract concept of pi. Or, more ...