Some say the reason most manhole covers are round is that a circle cannot fall through a smaller circular hole. Which of these other two-dimensional shapes cannot fall through a hole that is the same ...

A math puzzle is a type of brain teaser that tests the reader's critical thinking and problem-solving skills by challenging ...

This brain teaser is designed to gauge your logical and analytical thinking abilities, but it also tests your ability to ...

More about the shapes that can be made with complex dominoes ...