The Great Pyramid of Giza is often treated as a monument of stone, but it also functions as a monument of numbers. I see at ...

A geometry problem that puzzled mathematicians for nearly six decades has finally been cracked — and the breakthrough comes ...

Here’s a fairly recent twist on an old type of logic puzzle. A logician vacationing in the South Pacific finds himself on an island inhabited by the two proverbial groups of liars and truth-tellers.

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 ...