Now, more than 122 years after it was first proposed, Kamata and two other mathematicians have finally proved that a solution ...

NPR's Ayesha Rascoe plays the puzzle with Drew Skinner of Havertown, Pennsylvania, along with Weekend Edition Puzzle Master ...

However, when numbers are used in brain teasers, even those who usually avoid maths feel compelled to solve the challenge. A ...

Mathematical brain teasers have become a favourite pastime for puzzle enthusiasts, challenging both logical reasoning and ...

The words can be filled in horizontally or vertically and you must take into account the direction and number of letters in each word. Our puzzles can range in difficulty from easy to challenging with ...

A minimal, Julia-written tool for converting numbers to words.

Want access to more than one puzzle a day? Subscribe to the i Digital Subscription to unlock unlimited access to 27 daily puzzles online and in the app, plus additional content and exclusive ...

In the next section we briefly review the literature on presidential systems; in the third section we explore the puzzle that guides this study ... allowing a greater number of democracies to be ...