Many puzzle fans enjoy crosswords not just for the fun but for the benefits - puzzles help keep the mind limber and vocabulary expanding. The 150 crosswords in this book are divided into chapters, with each chapter focusing on a specific brain-boosting theme: vocabulary building, memorization, problem solving, etc. Will Shortz has paired up with a top neuroscientist, Dr. Majid Fotuhi, who provides introductions to each chapter and additional insight into brain health as well as facts and tips to keep your mind sharp!.