This holiday-themed brainteaser looks simple, but it's quietly tripping up adults everywhere. A math teacher walks us through ...

Holidays bring celebration, rest and, for many families, long stretches of indoor time. For some, this means tabletop games ...

The rules of Sudoku dictate that every row, column and 3×3 bolded box in the completed grid must contain the digits 1 through 9 exactly once. A surprising fact emerges from these simple rules. In ...

Here, count with me: 1, 2, 3, 4, 5, 6, 7, 8, 9, T, 11, 12 … Oh, what’s that? You write ten with “zero”? Fair enough. Zero, we have been told, is the ...

You are participating in a holiday gift exchange with a few classmates. You each write down your own name on a slip of paper and fold it up. Then all the students place their names into a single hat.

While many scroll past riddles and puzzles without a second thought, there’s a growing number of online users who pause, squint, and dive headfirst into these brain-twisting challenges. For them, a ...