Hannah handed me a piece of paper with the following string of letters. “Each letter stands for another one,” said Hannah. “Ooh, a substitution cipher!” I thought. But I was stumped. “Is this just one ...
Mental Floss columnist A.J. Jacobs has written a fascinating book called The Puzzler that will be released on April 26, 2022. The book is an exploration of the history, science, and joy of all kinds ...