'Where's Waldo?' is for amateurs. This is the big leagues. These puzzles are so truly, well, puzzling that even the people ...

In just a few moments, a person who has never once lost an argument is about to be completely undone by a photograph. They will look at it with the relaxed confidence of someone who considers ...

As an academic discipline, logic is the study of reasoning. Logic puzzles, therefore, involve solving problems by making a ...

This week’s puzzle is difficult. Not because it has an exceedingly complicated solution, but because the idea that underlies it is deep and ingenious. I only know of one method to solve it, but I’m ...

We are hardly ever consciously aware that we use logic to solve everyday problems. But what is logic? Is the logic used to prove theorems in mathematics the same kind that we use for our practical ...