Parallel Weighings

I introduce, solve and generalize a new coin puzzle that involves parallel weighings.Comment: 11 page

Hat Puzzles

This paper serves as the announcement of my program---a joke version of the Langlands Program. In connection with this program, I discuss an old hat puzzle, introduce a new hat puzzle, and offer a puzzle for the reader.Comment: 6 pages, 8 figure

Attacking ApSimon's Mints

ApSimon's Mints problem is a very difficult and often misunderstood counterfeit-coin puzzle. I explain the problem and suggest ways to approach it, while giving several fun exercises for the reader.Comment: 4 page