A parking lot puzzle has gone viral after leaving thousands scratching their heads, even though the solution is surprisingly straightforward. At first glance, the brain teaser looks like an ordinary ...

An amusing parlor trick is performed as follows. Ask spectator A to jot down any three-digit number and then to repeat the digits in the same order to make a six-digit number (e.g., 394,394). With ...

My son’s book of mathematical magic tricks includes this one: 1. Think of a whole number from 1 to 50. 2. Add 9 and double the result. 3. Multiply by 6 and add 12. 4. Subtract 60. 5. Divide by 12 and ...