You’re never too old to learn something new. People are losing their minds over how simple — yet tricky — an elementary school-level math equation posted on X (formerly Twitter) is. Over the weekend, ...

A system of nonlinear equations is harder to solve than you think—and more of a puzzle than a math problem. Puzzles like this require you to look and find the one loose end you can pull to unravel the ...

We've assembled the ultimate pop quiz.

Novelist Celeste Ng has shared a head-scratching system of equations that her 9-year-old son apparently made up over dinner: She’s right-using simultaneous equations does get really complicated, and ...