A version of this puzzle originally appeared in the February 1957 issue of Scientific American. We’d love to hear from you! E ...

Experience math in a whole new way. We'll play fun and challenging problem-solving games and puzzles from around the world, including Ancient China and Egypt, Europe, Asia, Africa and the Americas. We ...

It might not seem like there's enough information to solve these logic puzzles at first—but that's part of the fun!

What is the smallest number of weighings necessary to determine which stack is counterfeit? Show puzzle solution The counterfeit stack can be identified by a single weighing of coins. You take one ...