Optical illusions have always fascinated people, as they make our brains perceive things that aren't actually present. A popular illusion on social media challenges viewers to find the number of ...

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 ...

A viral math puzzle asks how many squares are in a picture. People guessed nine or ten squares. The challenge was shared on the Instagram page Math Quiz. When we say puzzles, what's the first thing ...

A brain teaser on Instagram puzzled users as they debated the number of squares in a grid, sparking lively reactions and diverse guesses in the comments. Brain teasers are a delightful way to ...

This past week's puzzle, as posted: If you have been on Facebook at all over the last year, you have probably seen the "puzzle" where there is a grid, and the question reads "How many squares do you ...