Welcome to The Riddler. Every week, I offer up problems related to the things we hold dear around here: math, logic and probability. There are two types: Riddler Express for those of you who want ...

Since its resounding return to Netflix, the series "Squid Game" has fascinated audiences as much for its plot as for its mysterious symbols. Geometric shapes—circles, triangles, and squares—are ...

A new proof breaks a decades-long drought of progress on the problem of estimating the size of triangles created by cramming points into a square. Consider a square with a bunch of points inside. Take ...