Crossword puzzles are built to entertain, but the tricky ones are built to mislead. A hard crossword clue isn’t just difficult because the answer is obscure, it’s difficult because the clue is ...

Illustrations by Elena Xausa. Animations by Lorenzo Fonda. Would you like to improve your mental flexibility, learn a few interesting things every day and establish bragging rights among your friends?

The audio version of this article is generated by AI-based technology. Mispronunciations can occur. We are working with our partners to continually review and improve the results. Tass and Lita ...