Imagine a world in which liars always lie and truth-tellers always tell the truth. Five people sit in a circle. Everybody ...

An ancient Chinese math puzzle shows how to win at cards, horse races and gerrymandering A stratagem that dates back two ...

Terence Tao grows coins ...

Mathematics is a “science which requires a great amount of imagination”, said the 19th-century Russian maths professor Sofya Kovalevskaya – a pioneering figure for women’s equality in this subject. We ...

I like sudoku as much as anyone, but a change of pace might be nice occasionally. Enter Sweet 16, a new math puzzle game. As the name suggests it involves the numbers 1 through 16, and it's a bit like ...

Can you beat the puzzle master? (Plus: find answers to Saturday’s puzzle.) ...

Jigsaw puzzles are a fun way to pass the time, but they've remained relatively unchanged for decades. But Nervous System Studio has come up with something new by designing a brand new type of jigsaw ...

An elementary-school math teacher silently paces his classroom in a pin-striped stockbroker shirt, his mouth full of braces. All around him, tiny students with pencils in hand struggle over puzzles at ...

Can you beat the puzzle master? (Plus: find answers to Friday’s puzzle.) ...