If you've got the time, we've got the riddle. And it's time for a riddle about time: How many numbers are on a clock?

Here at PopMech, we love mind-bending math and logic puzzles, which is why we regularly recruit the sharpest minds in the world to concoct riddles that will test your critical thinking, mathematics, ...

An airplane is flying in a straight line toward its landing strip when the pilot realizes their altimeter isn’t working. The pilot looks ahead and down, and sees the edge of the airfield at an angle ...

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The puzzle reads: 3 + 4 = 19 5 + 6 = 4 1 2 + 8 = 66 5 + 1 = ? At first glance, none of these make sense. According to standard math, 3 plus 4 is 7 — so how do we ...

Hungry for Pi? Check out NASA's Pi Day challenge and put your wits to the test solving problems just like NASA scientists and engineers. When you purchase through links on our site, we may earn an ...