There’s nothing quite like a maddening math problem, mind-bending optical illusion, or twisty logic puzzle to halt all productivity in the Popular Mechanics office. We’re curious people by nature, but ...

Brain teasers have long been enjoyed as a playful yet effective way to keep the mind sharp. They push people to think outside the box and even ignite friendly debates. Now, a new puzzle making the ...

Use a ruler, protractor and a pair of compasses to construct a triangle accurately. After the triangle has been constructed, leave the construction lines visible so each stage of the process is shown ...